DESCRIPTION:GE 12AU6 A 8426A Vacuum Tube TEKTRONIX Tested 100% ConditionTube: UsedSome boxes are brittle, or have imperfections, starting to crumble TESTED IN A HICKOK 752A1) Filament 2) checked for shorts, Leakage 3) Grid (Gas) 4) Emission Test 5) Dynamic Mutual Conductance Result on Tube 1 ( 800 GM ) Minimum Value = 475 Tube 2 ( 850 GM ) Minimum Value = 475Where NOS Value = 732AND6) Life Test = Useful Life in Tube =100% Since vacuum tubes were made 30 ? 70 years ago New Old Stock or Used may have cosmetic evidence of age. This includes poor print, oxidized pins, faint discoloration, or poorly boxTwo testers are never the same. So this shows what I get, and what you get may be slightly 10% different.If I state any values they are for a guide only.No guarantee is made that any tube will test to a specific value in the buyers tube tester, most all tubes are tested on at least two tube testersThis because of the variation in line voltage, different bias, and circuits. Return PolicyGuarantee:100% Contact UsIf youre in any way dissatisfied with your purchase, do not hesitate to contact us through MY MESSAGES. We will do our best to solve it for you. We are committed to ensuring that you are completely satisfied with every transaction.So Please DO contact us first to get a better solution before you would leave Negative or Neutral feedback. Shipping timesDomestic USPS First Class Mail: 3-7 Days, includes trackingInternational Request an invoice International BuyersPlease Note:Buyer is responsible for all taxes, duties, and import fees. Please contact your local customs office for costs.

Konvolut 20x Röhre 12AU6 von Telefunken UlmAlle mit Ulmer Code und Raute im Boden Unbenutzt / NOS aus ehem. BW-Bestand bzw. Großpackung Zur weiteren Beschreibung schauen Sie sich bitte die Bilder oben an. Zum genauen Betrachten können sie diese auch vergrößern. (Helle Stellen auf den Bildern sind nur Lichtreflexe) Wichtiges zu Ihrem Kauf: Sollte es zu irgendwelchen Problemen kommen, schreiben Sie mir bitte eine Nachricht, ich kümmere mich dann umgehend um eine Lösung. Wenn Sie Ihren Artikel erhalten haben, würde ich mich sehr über eine positive Bewertung freuen. Falls Sie zufrieden waren, geben Sie mir bitte auch 5 Sterne bei den detaillierten Bewertungen. Alle meine Artikel werden als versichertes Päckchen/Paket versendet. Papier und flache Kleinteile versende ich als Einschreiben. Sollten Sie beim Versand einen anderen Wunsch haben, geben Sie mir bitte Bescheid. BezahlungZahlungsmöglichkeiten: (Daten jeweils bei Ebay hinterlegt) Überweisung Barzahlung bei Übergabe PayPal Versandkosten nach Vertragsabschluß Bei Käufen aus Deutschland sende ich Ihnen nach Auktionsende keine gesonderte Zahlungsaufforderung, nutzen Sie bitte einfach die Kaufabwicklung über Ebay. Bei Käufen aus dem Ausland sende ich Ihnen innerhalb eines Tages eine Zahlungsaufforderung mit den jeweiligen Versandkosten via Ebay zu. EineBarzahlung und Abholung der Ware ist möglich und erfolgt nachtelefonischer und schriftlicher Terminsvereinbarung. (Wird in der Artikelbeschreibung kostenloser Versand angegeben, werden Ihnen für den jeweiligen Artikel natürlich keine Versandkosten berechnet) Die Versendung erfolgt über Hermes (nationaler oder internationaler Versand, jedoch nur EU) oder DHL (internationaler Versand, außerhalb der EU).

tube électronique (le tube HF94 est apparu dans les années 50) pentode RF/IF, chauffage indirect 12,6 V 0,15 A continuité du filament, isolation des électrodes et émissivité des cathodes testées à laide dun lampemètre TC-2 Certainement neuf car dans son emballage dorigine (non scellé) et aucune trace dutilisation. Petits caractères : 6628 Au Ce tube se trouve à Bovesse (entre Namur et Gembloux) Si vous connaissez un mode dexpédition qui vous convient mieux que celui proposé (moins cher, plus sûr ou plus commode), prévenez-moi AVANT de payer votre achat pour que vous envoie une facture corrigée. Exemple : livraison dans un point denlèvement Mondial Relay dun pays limitrophe de la Belgique.

tube électronique (le tube HF94 est apparu dans les années 50) pentode RF/IF, chauffage indirect 12,6 V 0,15 A continuité du filament, isolation des électrodes et émissivité des cathodes testées à laide dun lampemètre TC-2 Certainement neuf car dans son emballage dorigine (non scellé) et aucune trace dutilisation. Petits caractères : 6628 Au Ce tube se trouve à Bovesse (entre Namur et Gembloux) Si vous connaissez un mode dexpédition qui vous convient mieux que celui proposé (moins cher, plus sûr ou plus commode), prévenez-moi AVANT de payer votre achat pour que vous envoie une facture corrigée. Exemple : livraison dans un point denlèvement Mondial Relay dun pays limitrophe de la Belgique.

Wir haben deinradio! Senden Sie uns eine Nachricht Unser Shop Verkäuferprofil Bewertungen Shop speichern Kontakt 6x 12AU6 Röhre Telefunken geprüft top Brimar preamp Röhrenverstärker Vorstufe Bitte entnehmen Sie den genauen Zustand und Lieferumfang den Bildern.Die Röhren wurden als gut geprüft. Wir bieten eine Vielzahl an alten Bastel -und Sammelobjekten an.Bitte beachten Sie, dass aufgrund des Alters keine Garantien auf die technischen Funktionen gegeben werden können.The parts are very old, we dont give any guarantee on the technical function. Zahlung Versand Kombiversand nur bei Artikeln möglich, die am gleichen Tag gekauft werden. (aus einer Auktionsrunde) DIe angepasste Rechnung erhalten Sie dann nach Auktionsende. Aufwendiger Versand (klimaneutral) mit DHL Premium in 2-welliger Kartonage und aufwendiger Polsterung! Versand größtenteils plastikfrei, 80 Prozent des Versandmaterial aus recyceltem Altpapier bzw. Second-Hand Kartonagen. WORLDWIDE SHIPPING ON REQUEST! PLEASE ASK BEFORE YOU BUY! Links Unser Shop Verkäuferprofil Bewertungen Shop speichern Kontakt Newsletter Verpassen Sie keine Angebote mehr! Wir informieren Sie über Angebote und Aktionen bequem per E-Mail. Newsletter abonnieren Kontakt Senden Sie uns eine Nachricht

tube électronique (le tube HF94 est apparu dans les années 50) pentode RF/IF, chauffage indirect 12,6 V 0,15 A continuité du filament, isolation des électrodes et émissivité des cathodes testées à laide dun lampemètre TC-2 Certainement neuf car dans son emballage dorigine (non scellé) et aucune trace dutilisation. Petits caractères : 6628 Au Ce tube se trouve à Bovesse (entre Namur et Gembloux) Si vous connaissez un mode dexpédition qui vous convient mieux que celui proposé (moins cher, plus sûr ou plus commode), prévenez-moi AVANT de payer votre achat pour que vous envoie une facture corrigée. Exemple : livraison dans un point denlèvement Mondial Relay dun pays limitrophe de la Belgique.

DESCRIPTION:GE 12AU6 Vacuum Tube Tested 100% ConditionTube: UsedSome boxes are brittle, or have imperfections, starting to crumble TESTED IN A HICKOK 752A1) Filament 2) checked for shorts, Leakage 3) Grid (Gas) 4) Emission Test 5) Dynamic Mutual Conductance Result on Tube 1 ( 800 GM ) Minimum Value = 475Where NOS Value = 732AND6) Life Test = Useful Life in Tube =100% Since vacuum tubes were made 30 ? 70 years ago New Old Stock or Used may have cosmetic evidence of age. This includes poor print, oxidized pins, faint discoloration, or poorly boxTwo testers are never the same. So this shows what I get, and what you get may be slightly 10% different.If I state any values they are for a guide only.No guarantee is made that any tube will test to a specific value in the buyers tube tester, most all tubes are tested on at least two tube testersThis because of the variation in line voltage, different bias, and circuits. Return PolicyGuarantee:100% Contact UsIf youre in any way dissatisfied with your purchase, do not hesitate to contact us through MY MESSAGES. We will do our best to solve it for you. We are committed to ensuring that you are completely satisfied with every transaction.So Please DO contact us first to get a better solution before you would leave Negative or Neutral feedback. Shipping timesDomestic USPS First Class Mail: 3-7 Days, includes trackingInternational Request an invoice International BuyersPlease Note:Buyer is responsible for all taxes, duties, and import fees. Please contact your local customs office for costs.

  TUBE HUNTER VACUUM TUBE GEMS THESE ARE THE SPECIFICS OF THE TUBE/TUBES/PARTS FOR SALE THESE ARE THE TUBE/TUBES/PARTS FOR SALE:  MANUFACTURER:                               WESTINGHOUSE PRODUCTION CITY:                                       US TUBE TYPE:     12AU6 A 8426 DESIGNATION:                                               MINIATURE PENTODE YEAR:     1960 MONTH OR WEEK    13 Date code match    SINGLE SILK SCREEN CONDITION %:                   100% MICA:   2 PLATES:   GREY GM%:   121% SINGLE/PAIR/QUAD/MULTI:   SINGLE  GETTER:                                                         O GETTER DATE CODE                                                        60R13 This auction is for ONE TUBE!!!  I guarantee you will not be disappointed. STOCK PHOTO Normal 0 false false false EN-US X-NONE X-NONE On my tester a B&K 747 tester:    Below 55 = BAD    55-66 = ?     65 -100 = Good    100-120+ = NOS    I want to see you happy with your purchase. I will never sell a tube that is below standard…… I have sold many tubes here on Ebay, and all my customers have been completely satisfied. I will work with you in good faith if there are any problems, or if you are unsatisfied in any way. I want your business now and in the future, so I assume you are the boss, and I am the employee. All tubes are tested for shorts, continuity, and emissions. I prefer PayPal. ALL CUSTOMERS PLEASE READ ALL NOTES BEFORE BUYING FROM ME !! 1.  RETURNS: It is my highest desire that you are completely satisfied with your purchase from me. I will bend over backwards to make sure that you are a happy customer. If anything you buy from me is less than satisfactory, message me BEFORE you either open a case or hit the “item not as described” button. Sound quality is tremendously SUBJECTIVE. For tubes returned for noise or sound quality of any kind you pay for the shipping we refund the purchase. We refund the price of the item NOT THE SHIPPING COST. If we sent the wrong tube we will of course pay for return shipping. For any tubes that are DOA we require that you send a us a picture of the shipping box to show us the damage. We test EVERY tube sent out and none should be DOA unless broken in shipping. 2.    PLEASE NOTE:  Tube silkscreen (lettering on the tubes) is VERY fragile. It can be wiped off and destroyed VERY easily. If you wipe off the silkscreen while handling the tube you diminish their value by up to 70%. DO NOT handle the tubes or hold them from the cylinder. ALWAYS hold them from the ENDS. If you are returning tubes and they are not in the same condition cosmetically I cannot give you a full refund. THIS IS VERY IMPORTANT. 3.  UNLESS YOU MAKE ARRANGEMENTS WITH US BEFORE YOU PURCHASE, YOU MUST PAY FOR ITEMS PURCHASED WITHIN 2 DAYS OR A CASE WILL BE OPENED FOR AN UNPAID ITEM!!! 4. TESTING: I test all tubes that I sell in one way or another, or I will state untested. I have a B&K 747 tube tester. This is a mutual conductance tester. It give a percentage value of gm for the tube under test and checks for shorts and grid emissions. I also use a Tektronix curve tracer for testing triodes. I give a number of evaluations for tubes. One evaluation is a screen shot of the tube with a high voltage applied to the plate. This helps the buyer see the linearity of the tube in question at the highest voltage the tube will see in a real circuit. The Curve tracer steps the triode through 10 gate/grid voltages starting with -10 volts and going to 0 volts. The lines show how the tube conducts throughout that range. At 0 volt the tube is at max conduction and is the top line on the display. It is easy at that point to take where that top line intersects the plate voltage, find the milliamp level and compare it to the datasheet. I give those numbers for you in the Item condition box. To further help the buyer I also include the Design values, for gm and ma readings in the table. This can then be compared to other tube sellers using inferior test methods such as Hickok,  Amplitrex, and other testers. The Tektronix curve tracer gives values within 3% of the actual value. The very best portable testers only can approach 10% accuracy.5.    Please note: The numbers given for gm are what I see on my tester. I DO NOT guarantee that you will see those numbers on your tester. I only guarantee that these tubes will test good, with no shorts, or gas, on a decent calibrated tester. I dont guarantee or imply anything else. 6. VERY IMPORTANT!!! Vintage tube testers almost always, due to age, have VERY LOW HEATER VOLTAGES!!!  Every tester I have ever bought is below 6 volts when selecting 6.3 volts. They average 5.8 volts. The voltage NEEDS to be 6.3 and 12.6. You can calibrate a vintage tube tester all you want. If the heater voltage is not right, you will NEVER get the right gm value. I have customers complain that their tubes are not the same as what I see on my tester. They say they have a calibrated tube tester. I have 40 tube testers. On all of them I have an outside regulated DC power supply that feeds the tube tester the correct heater voltage. 7. I dont check each and every tube for noise or tone. This is SUBJECTIVE and it is too time consuming. If you dont like the noise level or the tone we offer a hassle free refund policy.  International customers note: 1. Please wait for us to invoice you for the correct amount. If you have purchased more than one item, we must calculate how much the shipping will be. Shipping will be HIGHER due to insurance and shipping methods needed for expensive item totals. If you are buying only one item this will not be an issue. 2. Under no circumstances will we state on a US customs a declared value of less than the sale price. This is an honesty issue. We are honest with everyone to the best of our ability to do so. We want you to trust that what we say is true. There cannot be that trust, if we make false statements knowingly to anyone. If your country has tariffs/taxes so high that they cause large numbers of normally honest folks to make false statements, we urge you to work for change of those laws. 3 International buyers if you bought more than one item and want combined shipping it will ship in 2 days. 4. And all the Angels sang because the heavenly music was playing and it was turned all the way up.   Listing and template services provided by inkFrog

family   TUBE HUNTER VACUUM TUBE GEMS THESE ARE THE SPECIFICS OF THE TUBE/TUBES/PARTS FOR SALE THESE ARE THE TUBE/TUBES/PARTS FOR SALE:  MANUFACTURER:     RCA PRODUCTION CITY:                                     USA TUBE TYPE:    12AU6 DESIGNATION:                                              TUBE YEAR:     1960s MONTH:     VARIES Date code match    SINGLE SILK SCREEN CONDITION %:                    100% MICA:    2 PLATES:    GREY GM %:     120% SINGLE/PAIR/QUAD/MULTI:     SINGLE GETTER:                                                          0  GETTER                                     DATE:      VARIES NOS NIB. This auction is for ONE TUBE. You will receive one of these tubes. All are NOS NIB and tested by by me.   THESE TUBES ARE NOS NIB. STOCK PHOTO Normal 0 false false false EN-US X-NONE X-NONE On my tester a B&K 747 tester:    Below 55 = BAD      55-65 = ?     65 -100 = Good     100-120+ = NOS   *********************************************************************************** IMPORTANT NOTE ON FILLING ORDERS With NOS tubes we will substitute NOS American tubes with NOS American of a different brand to fill an order if we are short the brand listed. If you are brand sensitive let me know BEFORE you order.  NOTES ON PHOTO PROPS:  THE RCA DOG, PHONOGRAPH, REDDY KILLOWATT, AND OTHER STATUETTES, INCLUDING DEVICES TO MAKE TUBES OR OTHER PARTS STAND UP STRAIGHT, ARE NOT PART OF THE SALE. THIS IS TRUE OF ANY PROPS USED IN PHOTOGRAPHY IN THE LISTING THAT ARE NOT SPECIFICALLY CALLED OUT IN THE LISTING AS ITEMS FOR SALE. NOTES ON PHOTOS FOR SINGLE TUBES: IF YOU ARE BUYING A SINGLE TUBE: FOR THE MOST PART WITH TUBES UNDER 15 DOLLARS WE ARE USING STOCK PHOTOS FOR SINGLES. YOUR MILEAGE MAY VARY. YOU WILL RECEIVE A NEW TUBE. IT WILL TEST NOS. IT MAY OR MAY NOT BE ONE OF THE ONES IN THE PICTURE. WE GET TUBES IN ALL THE TIME. WITH SINGLES OF A LOW VALUE WE ARE NOT PICKY ABOUT DATES AND CONSTRUCTION AND THINGS LIKE THAT. WE ALSO MAY SUBSTITUE A TUBE BY A DIFFERENT MANUFACTOR IF WE ARE LOW ON STOCK OF THAT BRAND SUCH AS AN RCA FOR A GE FOR EXAMPLE, BUT WE WILL NOT SEND A JAPANESE BRAND FOR A USA MADE TUBE, OR A LOWER QUALITY TUBE IN ANY WAY. IF WE ARE SELLING A PAIR, OR A HIGH VALUE SINGLE THEN WE GET SERIOUS ABOUT SUCH THINGS.  NOTES ON MATCHING: 1. TRIODES SIMILAR TO 12AX7 ARE DONE ON A TEKTRONIX 576 CURVE TRACER IF I HAVE MATCHED THEM WITH THIS MACHINE I GUARANTEE THAT THESE MATCHED PAIRS WILL BE NOT BE ABLE TO DIFFERENTIATED WITH THE HUMAN EAR IN A PREAMP CIRCUIT.  2. ON OTHER TUBE I USE A CALIBRATED HICKOK 600A TO MATCH TUBES. 3. ON MODERN TUBES, FOR WHICH THE 600A CANNOT PERFORM TESTS, I USE THE CALIBRATED B&K 747B TUBE TESTER. NOTES ON THE BOXES. LISTING WILL GENERALLY HAVE INFORMATION ABOUT ANY BOXES ASSOCIATED WITH THE TUBES FOR SALE. THESE ARE THE OPTIONS: 1. ORIGINAL BOXES IN VARYING CONDITION. THESE BOXES WILL BE THE ORIGINAL BOXES THE TUBES CAME IN AND WILL SHOW AGING IN VARYING DEGREES. THESE TUBES ARE ASSUMED TO BE NEW AND WILL TEST AS NOS. 2. NO BOXES PROVIDED (NONE AVAILABLE USUALLY USED AND SHOULD BE ASSUMED TO BE USED UNLESS OTHERWISE STATED. 3. REPURPOSED BOXES. THESE ARE BOXES OF THE SAME MANUFACTURER. THESE WILL HAVE A LABEL OVER THE TUBE NUMBER THAT REFLECTS THE TUBE BEING SOLD. THESE TUBES SHOULD BE ASSUMED TO BE USED UNLESS OTHERWISE STATED. 4. TUBEHUNTER BOXES. THESE ARE BOXES I HAVE MADE WITH GREAT TIME AND EXPENSE TO PROTECT YOUR VACUUM TUBES AND PROVIDE FOR STORAGE AND EASY IDENTIFICATION. TUBES IN THESE BOXES SHOULD BE ASSUMED TO BE USED UNLESS OTHERWISE STATED. 5. WHITE BOXES. SHOULD BE SELF EXPLANATORY. NOTES ON TESTING OF TUBES: THIS IS DONE ON A NUMBER OF TESTING DEVICES 1. TEKTRONIX CURVE TRACER 2. B&K 747 TUBE TESTER 3. MERCURY 1000 DYNAMIC MUTUAL CONDUCTANCE TESTER 4. HICKOK 600A DYNAMIC MUTUAL CONDUCTANCE TUBE TESTER  I test all tubes that I sell in one way or another, or I will state untested. I have a B&K 747 tube tester. This is a mutual conductance tester. It give a percentage value of gm for the tube under test and checks for shorts and grid emissions. I also use a Tektronix curve tracer for testing triodes. I give a number of evaluations for tubes. One evaluation is a screen shot of the tube with a high voltage applied to the plate. This helps the buyer see the linearity of the tube in question at the highest voltage the tube will see in a real circuit. The Curve tracer steps the triode through 10 gate/grid voltages starting with -10 volts and going to 0 volts. The lines show how the tube conducts throughout that range. At 0 volt the tube is at max conduction and is the top line on the display. It is easy at that point to take where that top line intersects the plate voltage, find the milliamp level and compare it to the datasheet. I give those numbers for you in the Item condition box. To further help the buyer I also include the Design values, for gm and ma readings in the table. This can then be compared to other tube sellers using inferior test methods such as Hickok,  Amplitrex, and other testers. The Tektronix curve tracer gives values within 3% of the actual value. The very best portable testers only can approach 10% accuracy. 5.    Please NOTE: The numbers given for gm are what I see on my tester. I DO NOT guarantee that you will see those numbers on your tester. I only guarantee that these tubes will test good, with no shorts, or gas, on a decent calibrated tester. I dont guarantee or imply anything else. 6. VERY IMPORTANT NOTE!!! Vintage tube testers almost always, due to age, have VERY LOW HEATER VOLTAGES!!!  Every tester I have ever bought is below 6 volts when selecting 6.3 volts. They average 5.8 volts. The voltage NEEDS to be 6.3 and 12.6. You can calibrate a vintage tube tester all you want. If the heater voltage is not right, you will NEVER get the right gm value. I have customers complain that their tubes are not the same as what I see on my tester. They say they have a calibrated tube tester. I have 40 tube testers. On all of them I have an outside regulated DC power supply that feeds the tube tester the correct heater voltage. 7. NOTE I dont check each and every tube for noise or tone. This is SUBJECTIVE and it is too time consuming. If you dont like the noise level or the tone we offer a hassle free refund policy.  8. NOTE. TESTING RESULTS SHOW HOW THE TUBE IS PERFORMING  NOW.  TESTING RESULTS DO NOT SHOW HOW OLD A TUBE IS OR HOW MANY HOURS IT HAS BEEN USED. HOWEVER IF A TUBE TEST NOS YOU CAN BE ASSURED IT WILL LAST A LONG TIME AND IS WORKING VERY WELL. NOTES ON CUSTOMER RELATIONS: I want to see you happy with your purchase. I will never sell a tube that is below standard…… I have sold many tubes here on Ebay, and all my customers have been completely satisfied. I will work with you in good faith if there are any problems, or if you are unsatisfied in any way. I want your business now and in the future, so I assume you are the boss, and I am the employee. All tubes are tested for shorts, continuity, and emissions. I prefer PayPal. NOTES ON RETURNS: 1.  NOTE: RETURNS: It is my highest desire that you are completely satisfied with your purchase from me. I will bend over backwards to make sure that you are a happy customer.2. NOTE: We almost always have a replacement available of the same or sometimes even higher quality. Please note that it is our desire TO DO BUSINESS! We never rip anyone off.......EVER. 3. NOTE: If anything you buy from me is less than satisfactory, message me BEFORE you either open a case or hit the “item not as described” button.4. NOTE: Sound quality is tremendously SUBJECTIVE. For tubes returned for noise or sound quality of any kind you pay for the shipping we refund the purchase. We refund the price of the item NOT THE SHIPPING COST. If we sent the wrong tube we will of course pay for return shipping. For any tubes that are DOA we require that you send a us a picture of the shipping box to show us the damage. We test EVERY tube sent out and none should be DOA unless broken in shipping.5.    PLEASE NOTE:  Tube silkscreen (lettering on the tubes) is VERY fragile. It can be wiped off and destroyed VERY easily. If you wipe off the silkscreen while handling the tube you diminish their value by up to 70%. DO NOT handle the tubes or hold them from the cylinder. ALWAYS hold them from the ENDS. If you are returning tubes and they are not in the same condition cosmetically I cannot give you a full refund. THIS IS VERY IMPORTANT. 6. NOTE: UNLESS YOU MAKE ARRANGEMENTS WITH US BEFORE YOU PURCHASE, YOU MUST PAY FOR ITEMS PURCHASED WITHIN 2 DAYS OR A CASE WILL BE OPENED FOR AN UNPAID ITEM!!! International customers  NOTE: 1. Please wait for us to invoice you for the correct amount. If you have purchased more than one item, we must calculate how much the shipping will be. Shipping will be HIGHER due to insurance and shipping methods needed for expensive item totals. If you are buying only one item this will not be an issue. 2. NOTE: Under no circumstances will we state on a US customs a declared value of less than the sale price. This is an honesty issue. We are honest with everyone to the best of our ability to do so. We want you to trust that what we say is true. There cannot be that trust, if we make false statements knowingly to anyone. If your country has tariffs/taxes so high that they cause large numbers of normally honest folks to make false statements, we urge you to work for change of those laws. 3 NOTE: International buyers if you bought more than one item and want combined shipping it will ship in 2 days.4. NOTE: And all the Angels sang because the heavenly music was playing and it was turned all the way up.     Listing and template services provided by inkFrog

DESCRIPTION:GE 12AU6 Vacuum Tube Tested 100% ConditionTube: UsedSome boxes are brittle, or have imperfections, starting to crumble TESTED IN A HICKOK 752A1) Filament 2) checked for shorts, Leakage 3) Grid (Gas) 4) Emission Test 5) Dynamic Mutual Conductance Result on Tube 1 ( 850 GM ) Minimum Value = 475Where NOS Value = 732AND6) Life Test = Useful Life in Tube =100% Since vacuum tubes were made 30 ? 70 years ago New Old Stock or Used may have cosmetic evidence of age. This includes poor print, oxidized pins, faint discoloration, or poorly boxTwo testers are never the same. So this shows what I get, and what you get may be slightly 10% different.If I state any values they are for a guide only.No guarantee is made that any tube will test to a specific value in the buyers tube tester, most all tubes are tested on at least two tube testersThis because of the variation in line voltage, different bias, and circuits. Return PolicyGuarantee:100% Contact UsIf youre in any way dissatisfied with your purchase, do not hesitate to contact us through MY MESSAGES. We will do our best to solve it for you. We are committed to ensuring that you are completely satisfied with every transaction.So Please DO contact us first to get a better solution before you would leave Negative or Neutral feedback. Shipping timesDomestic USPS First Class Mail: 3-7 Days, includes trackingInternational Request an invoice International BuyersPlease Note:Buyer is responsible for all taxes, duties, and import fees. Please contact your local customs office for costs.

DESCRIPTION:GE 12AU6 Vacuum Tube Tested 100% ConditionTube: UsedSome boxes are brittle, or have imperfections, starting to crumble TESTED IN A HICKOK 752A1) Filament 2) checked for shorts, Leakage 3) Grid (Gas) 4) Emission Test 5) Dynamic Mutual Conductance Result on Tube 1 ( 825 GM ) Minimum Value = 475Where NOS Value = 732AND6) Life Test = Useful Life in Tube =100% Since vacuum tubes were made 30 ? 70 years ago New Old Stock or Used may have cosmetic evidence of age. This includes poor print, oxidized pins, faint discoloration, or poorly boxTwo testers are never the same. So this shows what I get, and what you get may be slightly 10% different.If I state any values they are for a guide only.No guarantee is made that any tube will test to a specific value in the buyers tube tester, most all tubes are tested on at least two tube testersThis because of the variation in line voltage, different bias, and circuits. Return PolicyGuarantee:100% Contact UsIf youre in any way dissatisfied with your purchase, do not hesitate to contact us through MY MESSAGES. We will do our best to solve it for you. We are committed to ensuring that you are completely satisfied with every transaction.So Please DO contact us first to get a better solution before you would leave Negative or Neutral feedback. Shipping timesDomestic USPS First Class Mail: 3-7 Days, includes trackingInternational Request an invoice International BuyersPlease Note:Buyer is responsible for all taxes, duties, and import fees. Please contact your local customs office for costs.

A (4) piece lot of audio - guitar - amplifier - HAM - radio - TV tubes, type 12AU6. The tubes are used, various brands. Tubes test good on the Heath IT-17 tube tester. While youre here, please have a look at my other listings! Payment: Pay-Pal is preferred. I will accept a check from USA. Kindly make your payment within 4 business days. Shipping & handling: the cost listed is the EBAY calculated price to ship via USPS from 08822 to continental US. If you are elsewhere, require tracking, need insurance, or prefer other shipping arrangements, please contact me. Shipping can often be combined for multiple purchases. No charge for packing with care! Please verify that your shipping address is correct and valid.

DESCRIPTION:GE 12AU6 Vacuum Tube Tested 100% ConditionTube: UsedSome boxes are brittle, or have imperfections, starting to crumble TESTED IN A HICKOK 752A1) Filament 2) checked for shorts, Leakage 3) Grid (Gas) 4) Emission Test 5) Dynamic Mutual Conductance Result on Tube 1 ( 850 GM ) Minimum Value = 475Where NOS Value = 732AND6) Life Test = Useful Life in Tube =100% Since vacuum tubes were made 30 ? 70 years ago New Old Stock or Used may have cosmetic evidence of age. This includes poor print, oxidized pins, faint discoloration, or poorly boxTwo testers are never the same. So this shows what I get, and what you get may be slightly 10% different.If I state any values they are for a guide only.No guarantee is made that any tube will test to a specific value in the buyers tube tester, most all tubes are tested on at least two tube testersThis because of the variation in line voltage, different bias, and circuits. Return PolicyGuarantee:100% Contact UsIf youre in any way dissatisfied with your purchase, do not hesitate to contact us through MY MESSAGES. We will do our best to solve it for you. We are committed to ensuring that you are completely satisfied with every transaction.So Please DO contact us first to get a better solution before you would leave Negative or Neutral feedback. Shipping timesDomestic USPS First Class Mail: 3-7 Days, includes trackingInternational Request an invoice International BuyersPlease Note:Buyer is responsible for all taxes, duties, and import fees. Please contact your local customs office for costs.

Welcome to Vacuum Tube Depot llc! We have been one of the leading online suppliers of vacuum tubes for many years. Recently, we acquired a very large collection of tubes that we are excited to offer. We have tested and sold thousands of these tubes, and have many, many more to sell. After testing literally thousands of tubes from this collection, we have found only a small handful that did not test well. The vast majority tested strong. Buy with confidence, and if you are not happy with your purchase, you can send it back on your dime for a refund. We will combine shipping on multiple purchases within 5 days of the first auction ending. Payment must be made within 5 days or your purchase will be canceled and re-listed. We do not have the space to hold onto auctions for you for any longer than this. If you would like combined shipping, please wait to make payment until after we have sent your invoice. We send invoices each day after all auctions have ended for that day. Combined shipping can only be combined with this shop, not other shops with similar names. Thank you for shopping with Vacuum Tube Depot llc! We have tons of these flats loaded with tubes. We opened maybe tons boxes to make sure tubes matched the boxes, out of all the boxes we opened. Most matched, but several had the correct number but different brand from box. Sold as is

Item is one unmatched lot of Assorted Brands 12AU6 vacuum tubes. These tubes are used and have dust, shadowing or label discoloration that appear with extended use. However, they are clean and test strongly and will perform well for a long time. These tubes and have been tested and are good. All tested tubes are at least GOOD on my Superior Instrument tube tester (most 7, 8 or 9 pin tubes) or meet the minimum strength on my U-Test-Em drug store tester (most other tubes). If a tube is labelled as untested, it is because I do not have the necesssary equipment to test it. All tubes that dont meet your expectations can be returned regardless of their test status. Sets of vacuum tubes labelled as pairs, quartets, sets, etc, came to me grouped together or labelled as such. My tube testers are not sophisticated enough to guarantee that all sets of tubes are fully matched correctly. Again, if you are unsatisfied with the tubes you receive, you can send them back for a refund. --> All items are inspected to ensure that they ship in working order ready to use. Any damage or wear outside of that which comes from normal usage is noted above in the description. Photos are of the actual item for sale, or if more than one is available, representative of any of them. Save on Shipping!!! Single items ship to anywhere in the USA at the shipping price listed. If you buy more than one item in the same order, the additional items will ship for free. For buyers in the United States, this discount is calculated automatically when you pay. Buyers in other countries should contact me for a shipping quote. Items will ship either USPS first class or Priority Mail at my discretion. So, please check out the other items I have for sale to save on shipping. I pack and ship the items usually within one to three days after payment is received, so please do not complete checkout until you have everything you need so the shipping discount can be applied properly and all items can be shipped together. Shipping To Other Countries We now ship to many countries worldwide! Shipping charges will vary by country as well as by the number, size and weight of the items won. If you are outside the United States, please contact me before buying to get shipping rates as the postage varies from country to country and I cannot list them all here. Tariffs, duties, and other charges are your responsibility and are not included in the shipping charges. We accept Paypal only for foreign orders. K4 Item #EL-0161

A (2) piece set of audio - guitar - amplifier - HAM - radio - TV tubes, 12AU6.The tubes are n. o. s. in white military boxes boxes, TUNG-SOL brand.Tubes test good on the Heath IT-17 tube tester. Matching 6251 date codes. Test readings match up well.While youre here, please have a look at my other listings ! Payment: Pay-Pal is preferred. I will accept a check from USA. Kindly make your payment within 4 business days. Shipping & handling: the cost listed is the EBAY calculated price to ship via USPS from 08822 to continental US. If you are elsewhere, require tracking, need insurance, or prefer other shipping arrangements, please contact me. Shipping can often be combined for multiple purchases. No charge for packing with care! Please verify that your shipping address is correct and valid.

2 National 12AU6/8426A RF/AF Amplifier Pentode Valve- BangyBang Tubes Brand National Model 12AU6 Type Pentode Use Vf 12.6 Volts / If 0.15 Ampere / Indirect RF pentode for use up to 50 MHz. Similar/Equiv N/A Condition New in Box (NOS) Tubes per listing 2 12XXXX 2 National 12AU6/8426A RF/AF Amplifier Pentode Valve- BangyBang Tubes Brand National Model 12AU6 Type                                          Pentode Use Vf 12.6 Volts / If 0.15 Ampere / Indirect  RF pentode for use up to 50 MHz. Similar/Equiv N/A Condition New in Box (NOS) Tubes per listing 2   12XXXX × Buy now and save! Shipping info Click the Shipping & Payments tab above the listing description for more info Click the Shipping & Payments tab above the listing description for more info! Additional delivery notes PICK UP OPTION Sorry, our items are NOT available for pick-up. PAYMENT Immediate payment is required upon selecting Buy It Now or upon checking out through the cart. We accept payment via U.S. PayPal accounts and all Major Credit Cards, Debit Cards & Google Pay. We are legally required to collect sales tax in those states and localities where we maintain a physical presence (nexus). The applicable amount of sales tax charged to an order will be calculated based on the shipment destinations state and local sales tax laws. Thank you for shopping with us on eBay! Paying via Direct Deposit Simply add the freight cost to the item cost and forward the total amount to the address to be provided following your purchase. Additional Information No additional information at this time Ask seller a question You might also like Matched Pair Sylvania/GE 5AU4/5V3 Full Wave Rectifier Guitar Amp.Tube- BangyBang Matched Pair General Electric 5AU4/5V3 Full Wave Rectifier Guitar Amp.Tube- Bang Matched Pair General Electric 5AU4/5V3 Full Wave Rectifier Guitar Amp.Tube- Bang Matched Pair Tung-Sol/RCA 5AU4/5V3 Full Wave Rectifier Guitar Amp.Tube- BangyBan Contact To contact our Customer Service Team, simply click the button here and our Customer Service team will be happy to assist. Ask seller a question © Bangybang Shipping & Payments Click the Shipping & Payments tab above the listing description for more info Payment Accepted Payment Methods Immediate payment is required upon selecting Buy It Now or upon checking out through the cart. We accept payment via U.S. PayPal accounts and all Major Credit Cards, Debit Cards & Google Pay. We are legally required to collect sales tax in those states and localities where we maintain a physical presence (nexus). The applicable amount of sales tax charged to an order will be calculated based on the shipment destinations state and local sales tax laws. Thank you for shopping with us on eBay! Returns Returns are accepted Items must be returned within 30 days of the auction ending Buyer will pay for return shipping. eBay integration by

Welcome to JNS Vintage Radios and Tubes Vintage Vacuum Tubes RCA**Pair** 12AU6 (EF94 CV1961) Description: The RCA 12AU6 is a 7 Pin Miniature with clear glass, black plate, halo getter and clean pins. Test Results: These RCA 12AU6s were tested using a Hickok 539B with a good tube reading above 2500gm.Tube 1: 3850gmTube 2: 3850gmThe test results showed no shorts, no grid emissions and passed the Long-Life Reserve Test. Comments: This clean RCA 12AU6 pair has a wide range of applications in radios, record players and lab equipment. Visit Our Store@https://www.ebay.com/str/jnsvintageradioandtubes 60-day free return. JNS Vintage Radio is a veteran owned store supporting The Wounded Warrior Project. Your purchase helps support this organization. Proud Members of the California Historical Radio Society.______________________________________________________________________________________________General Info: Please read the listing in its entirety to understand what you are purchasing.If any information is unclear, its better to ask questions now than to have a return. JNS Vintage Radios and Tubes aims to be as accurate as possible when describing and testing radios and tubes. However, we are not experts in all Antique/Vintage Radios, Electronic Equipment and Vacuum Tubes. If you see an error, please contact us thru the eBay messaging system so we may correct the listing. Our vacuum tubes are inspected and tested on our newly rebuilt/calibrated Hickok 539B tester. The 539B is one of the best Hickok Testers. Each tube is cleaned and allowed to warm-up for 90 seconds prior to actual testing. Tubes are tested for quality, life, grid emissions and shorts. No tube is offered for sale that tests below the min number given. We also use our Triplett 3413B as a backup tester. Please note that all tube testers are not created equal, and your tester may show a higher or lower test result than our test equipment. All tubes are wrapped in bubble wrap, packed with peanuts and shipped in a sturdy cardboard box to protect it during transit. All antique and vintage radios are cleaned and tested when possible. Well provide an accurate description of the condition within the listing based on our findings. If you find an error or omission, please send us a message thru eBays message system. We now offer restored/repaired chassis by Bob Kelly Radio Restorations here in the Sierra. Bob has over 45 years as an electronics technician in the communications industry and has provided quality radio restorations for many years. Radios are wrapped in bubble wrap and packed with peanuts and when necessary, squares of Styrofoam used to protect glass dials, knobs and switches. A word on shipping:JNS Vintage Radios and Tubes uses the United States Postal Service for the majority of our shipments both in the US and Internationally. We employ the eBay shipping calculator to estimate shipping costs. We do not charge a handling fee unless the item is heavy and requires additional attention such as double boxing or needing a shipping crate built.The majority of our shipments use First Class Mail for vacuum tubes and Priority Mail for larger items which provides tracking and insurance. We also use Fed Ex as needed to help save you money. Please contact us should you desire another shipping service. While the eBay shipping calculator is usually accurate, but not always, It is our policy to refund any excess shipping after the item has shipped. Need a firm shipping quote? Contact us. All taxes and duties for international shipments are the responsibilities of the buyer. Please contact your local Customs or Import Authorities. A word regarding returns:If you receive your item and it is damaged. Please contact us first. We want you to be satisfied with your purchase and we work diligently to ensure concerns are resolved fairly, promptly and to your satisfaction. Communication is the key to a successful return. We are proud of our feedback profile maintaining a 100% satisfaction rate since 2014.Returns will be excepted on all tubes and radios unless otherwise specified in the listing description.Returns must be in the original packaging and must have a tracking number assigned. Delivery signature is not required. If the item has been damaged through shipping, please contact us first on how to proceed. This crucial step protects both the buyer and seller and ensures that claims get approved fast and quickly paid. There are no returns authorized on Untested Parts or Parts or Repair items. These items are purchased AS IS and will be stated in the listing description. JNS Vintage Radios and Tubes thanks you for visiting our store and allowing us to provide you quality tubes and vintage radios.

1 x NOS 12AU6, HF94, US TUBES, GE, SYLVANIA, TEONEX, OWN BOX - 1 x NOS Röhre in OVP Preis für 1 Röhre, price for 1 tube, Kombiversand, I combine DHL Versand in D: 5,50 Euro, outside Germany 9,50 Euro economy outside Germany I use Warenpost Premium , german Post / DHL, which includes tracking and insurance for many countries. Format and weightMinimum dimensions: Length 14.0 cm, width 9.0 cm, height 0.1 cm Maximum dimensions: Length 35.3 cm, width 25.0 cm, height 10.0 cm Maximum weight: 1,000 g Privatverkauf

Tung-Sol 12AU6 Vacuum Electron Tube NOS New condition with some box wearWe accept returns within 30 days. Please note, the item must be returned in the exact same condition as it was received. Please see pictures for complete condition & details. Shipping via: USPS First ClassU.S.A Seller – Not a Dropshipper! Thank you for supporting Small Businesses! All items are packed with care and shipped fast! Be sure to check out our feedback and store.

12AU6RCA GOOD PERFORMANCE FROM LOCAL CONSIGNOR FULL WARRANTY IN EACH TUBE AS LISTED =================================== ======================PLEASE LOOK PHOTOS ------------------------------------------------------------------------------------------------- ============================ International shipping available ------------------------------- ---------------------------------------------------- LOOK PICTURE Why wait, use Buy It Now and get it for a very low price if you live in the Howard County, MD Area I will consider arranging local pick-up or delivery if prior arrangements are made. LOCAL PICKUP FREE Always try to give as much information as possible but if you have more questions or would like more pictures then use the Ask Seller a Question link and I would be more than happy to provide them. A picture is worth a thousand words so take a look as that is the actual item and accessories you will receive. Thats it so please if you would like read my About Me page and Feedback and bid with confidence! Good luck and Happy Bidding All! Oh and as a last note...Please if you could do me the kindest of favors and only bid if you want this item as it does cost me time and money to relist these items. I will send an invoice within 24 hours so if you dont get an e-mail from me make sure your ebay contact information is up to date. YOU ARE WELCOME TO CHECK MY OTHERs AUCTION IN PROPARAGUAY STORE If an item does not meet your expectations please contact me prior to leaving feedback so that I may address any issues that you may have.-** I make every effort to ship within 5 BUSINESS days of receiving payment. (Read Will ship within 5 business days of receiving cleared payment .I has specified an extended handling time for this item ** My shipping costs are based on the shipping weight , insurance and the cost of packaging. Please check the eBay shipping calculator for shipping costs BEFORE bidding and bid if you are comfortable with my shipping timeline and costs..** Note: I have been experiencing a sharp increase in non-paying bidders. Once an auction ends, sellers have to pay auction fees based on the amount of the winning bid , After 3 days the system will open automatic the unpaid process, but you can contact to me to avoid it or cancel the deal , not problem in all , just contact to me .- I know that something something go wrong and i doesnt have any intention to hurt you account with the unpaid process, the process is opened for re-list the item soon as is possible.- PLEASE, contact to me if you have problem with the payment.- ** The Carrier will send an automatic email with the tracking number when the label is created .. Any question just contact to me by email or phone.-Thank you and God Bless..

tube électronique (le tube HF94 est apparu dans les années 50) pentode RF/IF, chauffage indirect 12,6 V 0,15 A continuité du filament, isolation des électrodes et émissivité des cathodes testées à laide dun lampemètre TC-2 Certainement neuf car dans son emballage dorigine (non scellé) et aucune trace dutilisation. Petits caractères : 6628 Au Ce tube se trouve à Bovesse (entre Namur et Gembloux) Si vous connaissez un mode dexpédition qui vous convient mieux que celui proposé (moins cher, plus sûr ou plus commode), prévenez-moi AVANT de payer votre achat pour que vous envoie une facture corrigée. Exemple : livraison dans un point denlèvement Mondial Relay dun pays limitrophe de la Belgique.

A (4) piece lot of audio - guitar - amplifier - HAM - radio - TV tubes, type 12AU6. The tubes are used, various brands. Tubes test good on the Heath IT-17 tube tester. While youre here, please have a look at my other listings! Payment: Pay-Pal is preferred. I will accept a check from USA. Kindly make your payment within 4 business days. Shipping & handling: the cost listed is the EBAY calculated price to ship via USPS from 08822 to continental US. If you are elsewhere, require tracking, need insurance, or prefer other shipping arrangements, please contact me. Shipping can often be combined for multiple purchases. No charge for packing with care! Please verify that your shipping address is correct and valid.

  TUBE HUNTER VACUUM TUBE GEMS THESE ARE THE SPECIFICS OF THE TUBE/TUBES FOR SALE THESE ARE THE TUBE/TUBES FOR SALE:    MANUFACTURER:                                GE PRODUCTION CITY:                                      USA TUBE TYPE:     12AU6 A 8426 DESIGNATION:                                               CHECKED TEKTRONIX YEAR:     1960S MONTH:    VARIES Date code match    YES SILK SCREEN CONDITION %:                   100% MICA:   2 PLATES:   GREY GM%:   100+%,100+% SINGLE/PAIR/QUAD/MULTI:   PAIR GETTER:                                                         O GETTER DATE CODE                                                   VARIES .This auction is for ONE PAIR OF TUBES!!! What does Checked Tube mean? Tektronix was the leader in high MEGAHZ machines. They were doing some really fast switching. Tektronix was building equipment that was on the leading edge of tube technology. They did things that required careful matching of tube characteristics, such as 18 tube distributed vertical amplifiers. Some of their circuits, by virtue of their being flat from DC to 100MHz, or so required tubes that had unusually stable characteristics. They needed the tubes to meet very high standards in some critical circuits. At times only a single manufacturer made tubes that met those standards.  Because of these special needs, Tektronix had a department dedicated to testing and matching vacuum tubes. They assigned, special part numbers to these highly tested and selected tubes. These tubes were selected by Tektronix for use in critical sections of precision testing equipment. They were hand selected for GM values and balance (within 2% per section). They also were checked for NOISE. They are the lowest noise tubes you can find for the brand selected. That is what the CHECKED STICKER are all about. Tektronix was very picky about the components that went into their equipment.  They made the VERY best test equipment of all time in my opinion.  These tubes are an embodiment of that fact. They sound great in my headphone amp, and they will in yours!  These are a great preamp tubes. Made by GE in the 1960s.  will be exact gm matches.  These tubes must test over 100% and matched to be sold in this auction. I guarantee you will not be disappointed. Normal 0 false false false EN-US X-NONE X-NONE Normal 0 false false false EN-US X-NONE X-NONE On my tester a B&K 747 tester:    Below 55 = BAD      55-65 = ?     65 -100 = Good     100-120+ = NOS         I want to see you happy with your purchase. I will never sell a tube that is below standard…… I have sold many tubes here on Ebay, and all my customers have been completely satisfied. I will work with you in good faith if there are any problems, or if you are unsatisfied in any way. I want your business now and in the future, so I assume you are the boss, and I am the employee. All tubes are tested for shorts, continuity, and emissions. I prefer PayPal. ALL CUSTOMERS PLEASE READ ALL NOTES BEFORE BUYING FROM ME !!1.  RETURNS: It is my highest desire that you are completely satisfied with your purchase from me. I will bend over backwards to make sure that you are a happy customer.If anything you buy from me is less than satisfactory, message me BEFORE you either open a case or hit the “item not as described” button.Sound quality is tremendously SUBJECTIVE. For tubes returned for noise or sound quality of any kind you pay for the shipping we refund the purchase. We refund the price of the item NOT THE SHIPPING COST. If we sent the wrong tube we will of course pay for return shipping. For any tubes that are DOA we require that you send a us a picture of the shipping box to show us the damage. We test EVERY tube sent out and none should be DOA unless broken in shipping.2.    PLEASE NOTE:  Tube silkscreen (lettering on the tubes) is VERY fragile. It can be wiped off and destroyed VERY easily. If you wipe off the silkscreen while handling the tube you diminish their value by up to 70%. DO NOT handle the tubes or hold them from the cylinder. ALWAYS hold them from the ENDS. If you are returning tubes and they are not in the same condition cosmetically I cannot give you a full refund. THIS IS VERY IMPORTANT.3.  UNLESS YOU MAKE ARRANGEMENTS WITH US BEFORE YOU PURCHASE, YOU MUST PAY FOR ITEMS PURCHASED WITHIN 2 DAYS OR A CASE WILL BE OPENED FOR AN UNPAID ITEM!!!4. TESTING: I test all tubes that I sell in one way or another, or I will state untested. I have a B&K 747 tube tester. This is a mutual conductance tester. It give a percentage value of gm for the tube under test and checks for shorts and grid emissions. I also use a Tektronix curve tracer for testing triodes. I give a number of evaluations for tubes. One evaluation is a screen shot of the tube with a high voltage applied to the plate. This helps the buyer see the linearity of the tube in question at the highest voltage the tube will see in a real circuit. The Curve tracer steps the triode through 10 gate/grid voltages starting with -10 volts and going to 0 volts. The lines show how the tube conducts throughout that range. At 0 volt the tube is at max conduction and is the top line on the display. It is easy at that point to take where that top line intersects the plate voltage, find the milliamp level and compare it to the datasheet. I give those numbers for you in the Item condition box. To further help the buyer I also include the Design values, for gm and ma readings in the table. This can then be compared to other tube sellers using inferior test methods such as Hickok,  Amplitrex, and other testers. The Tektronix curve tracer gives values within 3% of the actual value. The very best portable testers only can approach 10% accuracy.5.    Please note: The numbers given for gm are what I see on my tester. I DO NOT guarantee that you will see those numbers on your tester. I only guarantee that these tubes will test good, with no shorts, or gas, on a decent calibrated tester. I dont guarantee or imply anything else.6. VERY IMPORTANT!!! Vintage tube testers almost always, due to age, have VERY LOW HEATER VOLTAGES!!!  Every tester I have ever bought is below 6 volts when selecting 6.3 volts. They average 5.8 volts. The voltage NEEDS to be 6.3 and 12.6. You can calibrate a vintage tube tester all you want. If the heater voltage is not right, you will NEVER get the right gm value. I have customers complain that their tubes are not the same as what I see on my tester. They say they have a calibrated tube tester. I have 40 tube testers. On all of them I have an outside regulated DC power supply that feeds the tube tester the correct heater voltage.7. I dont check each and every tube for noise or tone. This is SUBJECTIVE and it is too time consuming. If you dont like the noise level or the tone we offer a hassle free refund policy.  International customers note:1. Please wait for us to invoice you for the correct amount. If you have purchased more than one item, we must calculate how much the shipping will be. Shipping will be HIGHER due to insurance and shipping methods needed for expensive item totals. If you are buying only one item this will not be an issue. 2. Under no circumstances will we state on a US customs a declared value of less than the sale price. This is an honesty issue. We are honest with everyone to the best of our ability to do so. We want you to trust that what we say is true. There cannot be that trust, if we make false statements knowingly to anyone. If your country has tariffs/taxes so high that they cause large numbers of normally honest folks to make false statements, we urge you to work for change of those laws.3 International buyers if you bought more than one item and want combined shipping it will ship in 2 days.4. And all the Angels sang because the heavenly music was playing and it was turned all the way up.    Listing and template services provided by inkFrog