Note: It cannot be directly connected to passive speakers! Can only be connected to active speakers or amplifiers! Fosi Audio Box X4 Phono Preamp with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control Click Here To See My Other Great Products

Overview:With wide applied range and practicability, this preamplifier can fit the majority of active speakers and power amplifiers in the market. The replaceable GE JAN 5654W NOS vacuum tube design optimizes the circuit. The audio part and the power part are completely separated, which minimizes the interference to the sound. The timbre is soft and beautiful, sweet and warm and with powerful bass, penetrating treble. With treble and bass adjustment, single power supply, its small and portable, bringing you enjoyment and convenience. Using high-quality aluminum alloy housing with gold-plated connectors, its durable and high-performance. NOTE: OPAMP IC CHIPS UPGRADED TO TEXAS INSTRUMENTS LME49720NA A SUPERIOR IC OPAMP COMPARED TO OEM CHIP SFeatures:* With wide applied range and practicability, it can fit the majority of active speakers and power amplifiers in the market.* The replaceable GE JAN 5654W NOS vacuum tubes design optimize the circuit.* The audio part and the power part are completely separated, which minimizes the interference to the sound.* The timbre is soft and beautiful, sweet and warm and with powerful bass & penetrating treble.* With treble and bass adjustment and single power supply, its small and portable bringing you enjoyment and convenience.* Using high-quality aluminum alloy housing with gold-plated connectors, its durable and high-performance.Specifications:Brand Name: FX-AUDIOModel Number: TUBE-03Tube Model: GE JAN 5654W (2 Matching Pairs) plus 1 set matched Russian OTK7 tubesFrequency Response: ±1.5(20Hz-20KHz)Audio Input Interface: RCAAudio Output Interface: RCARCA Output: 0.9VrmsSNR: 100dBTHD: 0.03%Treble Adjustable Range: ±6dBBass Adjustable Range: ±10dBInput Voltage: AC 100-240V, 50/60Hz; DC 12V/1AColor: BlackMain Item Size: approx. 12 * 9.8 * 3.3cm / 4.72 * 3.85 * 1.29inMain Item Weight: approx. 318g / 11.21ozPackage Size: approx. 22 * 21 * 7cm / 8.66 * 8.26 * 2.75inPackage Weight: approx. 566g / 19.96oz POWER SUPPLY & UNIT plus 3 SETS MATCHED TUBES INCLUDED. NO MANUAL. LESS THAN 1,000 HOURS ON EACH SET OF MATCHED TUBES.

New. Opened box but not used. Price for 2

Helping out with friends estate who was a Pro Audio Tech. 27 NOS Vintage GE/Tungsol 5654/5654W USA Tubes, Military, Ex Performance/Quality. There are 22 GE and 5 Tungsol. All tubes vintage USA, tested, New, excellent quality and performance. The shipping cost includes safe packing, insurance, prompt shipping and tracking number. Buy with confidence, see my feedback. Good listening, SonnY :)

Neuwertiger Zustand, gekauft im April 2023, inklusive 2 zusätzlichen RöhrenAs new condition bought in April 2023 to include 2 extra tubes Hinweis: Das ist ein Vorverstärker, aber nicht ein Leistungsvorstärker oder Phono-Vorverstärke. Der Vorverstärker kann nicht für Plattenspieler oder passive Lautsprecher verwendet werden.RCA-Eingang für Computer, CD, Handy, iPod und andere Player sowie RCA-Ausgang für digitale Verstärker, aktive Multimedia-Audiogeräte für verlustfreie Klangqualität (RCA-Kabel nicht im Lieferumfang enthalten).Kleines und kompaktes Design, mit optimaler integrierter Schaltung für kraftvollen, dynamischen und süßen Klang. Röhren können durch Röhren 6K4,6AK5, EF95, 5654,403B ersetzt werden.Der Vorverstärker verbessert alles, was mit Ihrer Musik zu tun hat: Detail, Transparenz, Unmittelbarkeit, Reichtum und Klang.Eingebaute Schalteraufprallschutzschaltung und Überhitzungsschutzschaltung, lange Lebensdauer dieses Geräts. Alle Aluminiumlegierungsschalen und 24 Monate-Garantie.Auf Seite rechts klicken Sie Verkauf von Fosi Audio Factory und dann eine Frage stellen. Sie stehen uns immer zur Verfügung. Please note that this is a preamplifier and cannot be utilized for turntables or passive speakers. It is not a power amplifier or phono preamp.This preamplifier features RCA inputs that can be connected to various devices such as computers, phones, iPods, and CD players. Additionally, it includes RCA outputs that can be used with digital amplifiers and active multimedia audio devices for lossless audio (Please note: RCA cables are not included).This preamplifier boasts a small and compact design and incorporates an optimal integrated circuit to deliver powerful, dynamic, and sweet sound. Furthermore, the tubes in this preamplifier can be replaced with 6K4, 6AK5, EF95, 5654, or 403B tubes.Experience a significant improvement in the detail, transparency, immediacy, richness, and tone of your music with this preamp. The preamp includes a 12V power supply, two 6K4 tubes, and user manual for convenient setup and operation.This preamp is equipped with a built-in Switch impact protection circuit and overheat protection circuit, ensuring a long lifespan for the unit. It features an all-aluminum alloy shell and includes an 24-month manufacturers warranty for your peace of mind.

1 x JAN-5654w G.E. Tube Made in USA NIB NOS I do combine S&H

  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:    FAA 5654W DESIGNATION:                                             HEADPHONE HEAVEN YEAR:    1982 MONTH:    AUGUST Date code match    YES SILK SCREEN CONDITION %:                    100% MICA:    2 PLATES:    GREY GM %:     124%, 124% SINGLE/PAIR/QUAD/MULTI:     PAIR GETTER:                                                          O GETTER DATE CODE                                                   8/82 ON BOX THIS AUCTION IS FOR ONE PAIR OF HAND MATCHED FAA CERTIFIED 5654Ws. MADE FOR USE IN AIRCRAFT AND GROUND INSTURMENTS WHERE PERFECTION IS CRUCIAL. GE FAA 5654Ws. THEY WILL MATCH WITHIN 2% This auction is for ONE PAIR !!!! These tubes are absolutely new old stock and new in the original box. NOS NIB. What does this mean for your amp and ears? The tone on these tubes are very transparent, hollow, with great stage presence. They sound great in my headphone amp, and they will in yours! These tubes were made at the end of the vintage era. I think it is better to buy any manufactured goods that were made at the end of of the run. Here is why: After a product is first made there are problems and bugs. As time goes by those bugs are worked out and the product gets refined. The end products are inevitably better than the first. My dad worked at GM for decades and he always told me not to buy the first year run of any model for that very reason.   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

Heizfaden ist ok ., nicht getestet

13x General Electric JAN 5654W / Upgrade 6J1Röhren haben alle den selben Code - wurden geprüft - alle Messwerte sind gut - Langleberöhrendie bereitgestellten Fotos zeigen den angebotenen Artikelaußerdem zeigen sie die Bestandteile der Lieferungweitere Artikel finden Sie in meinem Shop

10x General Electric JAN 5654W / Upgrade 6J1Röhren haben alle den selben Code - wurden geprüft - alle Messwerte sind gut - Langleberöhrendie bereitgestellten Fotos zeigen den angebotenen Artikel und alle Bestandteileweitere Artikel finden Sie in meinem Shop

Heizfaden ist ok ., nicht getestet

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!

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!

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!

  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:    FAA 5654W DESIGNATION:                                             HEADPHONE HEAVEN YEAR:    1982 MONTH:    AUGUST Date code match    YES SILK SCREEN CONDITION %:                    100% MICA:    2 PLATES:    GREY GM %:     124%, 124% SINGLE/PAIR/QUAD/MULTI:     PAIR GETTER:                                                          O GETTER DATE CODE                                                   8/82 ON BOX THIS AUCTION IS FOR ONE PAIR OF HAND MATCHED FAA CERTIFIED 5654Ws. MADE FOR USE IN AIRCRAFT AND GROUND INSTURMENTS WHERE PERFECTION IS CRUCIAL. GE FAA 5654Ws. THEY WILL MATCH WITHIN 2% This auction is for ONE PAIR !!!! These tubes are absolutely new old stock and new in the original box. NOS NIB. What does this mean for your amp and ears? The tone on these tubes are very transparent, hollow, with great stage presence. They sound great in my headphone amp, and they will in yours! These tubes were made at the end of the vintage era. I think it is better to buy any manufactured goods that were made at the end of of the run. Here is why: After a product is first made there are problems and bugs. As time goes by those bugs are worked out and the product gets refined. The end products are inevitably better than the first. My dad worked at GM for decades and he always told me not to buy the first year run of any model for that very reason.   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

Fosi Audio Box X4 Phono Preamp with JAN 5654W Vacuum Tubes for MM Turntable Phono Stage.Used only 30 days. Comes with the original box and all parts. Mint condition all around. Basically Brand New

  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:    FAA 5654W DESIGNATION:                                             HEADPHONE HEAVEN YEAR:    1982 MONTH:    AUGUST Date code match    YES SILK SCREEN CONDITION %:                    100% MICA:    2 PLATES:    GREY GM %:     124%, 124% SINGLE/PAIR/QUAD/MULTI:     PAIR GETTER:                                                          O GETTER DATE CODE                                                   8/82 ON BOX THIS AUCTION IS FOR ONE PAIR OF HAND MATCHED FAA CERTIFIED 5654Ws. MADE FOR USE IN AIRCRAFT AND GROUND INSTURMENTS WHERE PERFECTION IS CRUCIAL. GE FAA 5654Ws. THEY WILL MATCH WITHIN 2% This auction is for ONE PAIR !!!! These tubes are absolutely new old stock and new in the original box. NOS NIB. What does this mean for your amp and ears? The tone on these tubes are very transparent, hollow, with great stage presence. They sound great in my headphone amp, and they will in yours! These tubes were made at the end of the vintage era. I think it is better to buy any manufactured goods that were made at the end of of the run. Here is why: After a product is first made there are problems and bugs. As time goes by those bugs are worked out and the product gets refined. The end products are inevitably better than the first. My dad worked at GM for decades and he always told me not to buy the first year run of any model for that very reason.   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

xDuoo MT-602 Tube Class A Desktop Amplifier The item is in As New condition. Barely used. In perfect working condition with no faults or problems. The item comes in its original packaging, with all its original contents. Included are a pair of extra General Electric JAN 5654W (DLA900-86-C-0453) Tubes. Contents:- xDuuo MT-602 Amplifier- Original papers- Power supply- Power cable- 3.5mm to 6.35 adapter Specifications:2 x tube + transistor powerClass-A amplifierPower supply: DC12/1AOutput power: 1300mW (32?)Frequency response: 10Hz-60kHz (+/-0.5dB)Suitable headphone impedance: 16-600?Gain: +15dBSize: 4.7 x 3 x 1.5” (12 x 7.8 x 4cm)Weight: 0.83lbs (0.38kg)S/N: >115dBTHD+N: ?0.01% (1kHz & 32?) More info at: xDuoo MT-602 Review | Intro to Tubeland - Prime Audio Reviews Shipping: Will be shipped with International Standard Economy, with tracking, by Cyprus Post.

10x General Electric JAN 5654W / Upgrade 6J1wurden geprüft - alle Messwerte sind gut - Langleberöhrendie bereitgestellten Fotos zeigen den angebotenen Artikel und alle Bestandteileweitere Artikel finden Sie in meinem Shop