Dynaco a250 with seas speakers. I don’t know much about them other then they have seas components and the newer ones had a different brand. The tweeters have been changed because they where bad when I got them. I installed seas tweeters to keep them as close as I could. Cabinets have scratches here and there and one has tape on it that I didn’t try to remove. One mid range was ripped that I repaired with watered down Elmer’s and plays fine. L pads are a little scratchy when turning them. With that all being said they play nice. Local pick up only As is there is no warranty on vintage items

This is the legendary SCA-50 created by David Hafler in the 70s. Extremely clean and solid for its power rating. Along with the many inputs it also supplies 3- AC outlets 2-switched with the power switch and the other outlet servers as a through AC outlet for use with other components.SpecificationsPower output: 25 watts per channel into 8? (stereo)Frequency response: 15Hz to 45kHzTotal harmonic distortion: 0.25%Input sensitivity: 1.65mV (MM), 125mV (line)Channel separation: 60dB (line)Semiconductors: 2 x IC, 2 x FET, 17 x transistors, 24 x diodesDimensions: 13-1/2 x 12 x 4-1/4 inchesWeight: 15lbs

PaymentRest assured that our store offers a variety of payment methods.Please pay within 5 days after auction is finished. About UsWe are located in Japan.For electrical products check the manufacturer and product and convert to the voltage of each country.We plan to ship by FedEx or DHL.Please contact us as the shipping fee can be changed in some cases. Its our pleasure to make you happy by proposing our recommend item.If you have any questions or request about items please feel free to ask us. International Buyers - Please Note:-Import duties taxes and charges are not included in the item price or shipping charges. These charges are the buyers responsibility.-Please check with your countrys customs office to determine what these additional costs will be prior to bidding/buying.-These charges are normally collected by the delivering freight (shipping) company or when you pick the item up - do not confuse them for additional shipping charges.-We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior.>

Dynaco a250 with seas speakers. I don’t know much about them other then they have seas components and the newer ones had a different brand. The tweeters have been changed because they where bad when I got them. I installed seas tweeters to keep them as close as I could. Cabinets have scratches here and there and one has tape on it that I didn’t try to remove. One mid range was ripped that I repaired with watered down Elmer’s and plays fine. L pads are a little scratchy when turning them. With that all being said they play nice. Local pick up only As is there is no warranty on vintage items

Dynaco SCA-50 Stereo Amplifier Tested And Works?. Condition is Used. Shipped with USPS Ground Advantage. Tested works power button sticks sometimes when turning off but it’s not a issue you just pull it slightly and it functions normally

This is the legendary SCA-50 created by David Hafler in the 70s. Extremely clean and solid for its power rating. Along with the many inputs it also supplies 3- AC outlets 2-switched with the power switch and the other outlet servers as a through AC outlet for use with other components.SpecificationsPower output: 25 watts per channel into 8? (stereo)Frequency response: 15Hz to 45kHzTotal harmonic distortion: 0.25%Input sensitivity: 1.65mV (MM), 125mV (line)Channel separation: 60dB (line)Semiconductors: 2 x IC, 2 x FET, 17 x transistors, 24 x diodesDimensions: 13-1/2 x 12 x 4-1/4 inchesWeight: 15lbs

Dynaco a250 with seas speakers. I don’t know much about them other then they have seas components and the newer ones had a different brand. The tweeters have been changed because they where bad when I got them. I installed seas tweeters to keep them as close as I could. Cabinets have scratches here and there and one has tape on it that I didn’t try to remove. One mid range was ripped that I repaired with watered down Elmer’s and plays fine. L pads are a little scratchy when turning them. With that all being said they play nice. Local pick up only As is there is no warranty on vintage items

This is the legendary SCA-50 created by David Hafler in the 70s. Extremely clean and solid for its power rating. Along with the many inputs it also supplies 3- AC outlets 2-switched with the power switch and the other outlet servers as a through AC outlet for use with other components.SpecificationsPower output: 25 watts per channel into 8? (stereo)Frequency response: 15Hz to 45kHzTotal harmonic distortion: 0.25%Input sensitivity: 1.65mV (MM), 125mV (line)Channel separation: 60dB (line)Semiconductors: 2 x IC, 2 x FET, 17 x transistors, 24 x diodesDimensions: 13-1/2 x 12 x 4-1/4 inchesWeight: 15lbs

Dynaco a250 with seas speakers. I don’t know much about them other then they have seas components and the newer ones had a different brand. The tweeters have been changed because they where bad when I got them. I installed seas tweeters to keep them as close as I could. Cabinets have scratches here and there and one has tape on it that I didn’t try to remove. One mid range was ripped that I repaired with watered down Elmer’s and plays fine. L pads are a little scratchy when turning them. With that all being said they play nice. Local pick up only As is there is no warranty on vintage items

This is a vintage Dynaco MK III Output Transformer with model number A430-500. This is for a Dynaco MK III amplifier but has an added 500 ohm output tap. The ground, 4, 8, and 16 ohm taps are all there so it can be used as a usual MK 3 output transformer. The transformer has been used previously but is in good working condition. It is an essential component for anyone looking to restore or repair their vintage Dynaco amplifier. Get this reliable component today to enhance the performance of your vintage audio system.

MULLARD DYNACO CO-BRANDED ECC85 6AQ8 TUBE as pictured, it in good condition (tested on my tube tester where NOS tube normal ranged 105-110, min-good=65, max-good=120, tested tubes= 107/106 respectively, no short, no leak) Note: Youll receive the tube exactly as shown (we dont use stock photo) and this selling is final (NO RETURN OR REFUND) please buy or bib accordingly. Thanks for looking.

  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:    5750 6BE6W  DESIGNATION:                                             MADE FOR COLLINS RADIOS  YEAR:     1955 MONTH OR WEEK     JUNE Date code match    YES SILK SCREEN CONDITION %:                    100% MICA:    2 PLATES:    GREY GM %:     120% 122% SINGLE/PAIR/QUAD/MULTI:     PAIR GETTER:                                                          O GETTER                                    DATE:    6-55   NOS NIB     You will receive THIS PICTURED 1955 PAIR. This auction is for ONE PAIR.  THESE TUBES ARE NEW IN ORIGINAL BOXES. ALL TUBES ARE TESTED BEFORE THEY SHIP! 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

This is the legendary SCA-50 created by David Hafler in the 70s. Extremely clean and solid for its power rating. Along with the many inputs it also supplies 3- AC outlets 2-switched with the power switch and the other outlet servers as a through AC outlet for use with other components.SpecificationsPower output: 25 watts per channel into 8? (stereo)Frequency response: 15Hz to 45kHzTotal harmonic distortion: 0.25%Input sensitivity: 1.65mV (MM), 125mV (line)Channel separation: 60dB (line)Semiconductors: 2 x IC, 2 x FET, 17 x transistors, 24 x diodesDimensions: 13-1/2 x 12 x 4-1/4 inchesWeight: 15lbs

Custom made from .02 thick solid polished brass these badge measure 4 wide by 1.4 tall. Each badge is custom made on a diamond drag engraver and has double-sided tape on the back for easy installation on any smooth surface. Free shipping will be by USPS First Class small package with tracking. International delivery is by eBays International Shipping program.

This is the legendary SCA-50 created by David Hafler in the 70s. Extremely clean and solid for its power rating. Along with the many inputs it also supplies 3- AC outlets 2-switched with the power switch and the other outlet servers as a through AC outlet for use with other components.SpecificationsPower output: 25 watts per channel into 8? (stereo)Frequency response: 15Hz to 45kHzTotal harmonic distortion: 0.25%Input sensitivity: 1.65mV (MM), 125mV (line)Channel separation: 60dB (line)Semiconductors: 2 x IC, 2 x FET, 17 x transistors, 24 x diodesDimensions: 13-1/2 x 12 x 4-1/4 inchesWeight: 15lbs

This listing is for a rare find. It is a Melos Modified Dynaco Stereo 70. Melos went on to start his own hi-fi company. His TM- 90ST uses 6550a tubes and a compactron front end. The Dynaco was likely his inspiration for that design. The amp has extensive modifications. El34 tubes have been replaced with 6550 tubes. The front end has been replaced with Compactron 6u10 tubes. A solid state rectifier was added. The power supply has been beefed up to support the new tubes. High-quality RCA inputs were added to the front. The rear sports a new power cord and a set of modern binding posts. Currently, the 4 ohm and 8 ohm taps are wired. The 16 ohm tap is capped with wire nuts. The transformer housings and case bottom were painted blue. Machined aluminum feet were added as well. The iron is original Dynaco. The tubes are a matched quad of Sovetek 6550WE. One tube is missing the center locating post. Though it is not hard to orient the tube properly. Tubes have lots of life left. The sound is very clean and detailed. The amplifier doesnt color the sound as much as some other tube amps can. You are more than welcome to demo the amplifier in person if youre near Buffalo, NY. I have packed amplifiers like these before. It will arrive safely. I do not compromise on packing. Please check the pictures. Free shipping to contiguous 48 states only.

DYNACO MULLARD 6-PIECES TUNING TUBE LOT as pictured, pulled from DYNACO FM-3 tuner, untested (working condition is unknown) they are ECC85/6AQ8 (X1) ECF80/6BL8 (X1) 6BA6 (X2) 6AU6/EF94 (X2) Note: This selling is final (NO RETURN OR REFUND) Please buy or bid accordingly. Thanks for looking. FYI: Some of these tubes also been used in FISHER 500C FM-1000 SCOTT 4310 as well.

  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:    5750 6BE6W  DESIGNATION:                                             MADE FOR COLLINS RADIOS  YEAR:     1955 MONTH OR WEEK     JUNE Date code match    YES SILK SCREEN CONDITION %:                    100% MICA:    2 PLATES:    GREY GM %:     120% 122% SINGLE/PAIR/QUAD/MULTI:     PAIR GETTER:                                                          O GETTER                                    DATE:    6-55   NOS NIB    You will receive THIS PICTURED 1955 PAIR. This auction is for ONE PAIR.  THESE TUBES ARE NEW IN ORIGINAL BOXES. ALL TUBES ARE TESTED BEFORE THEY SHIP! 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

This is the legendary SCA-50 created by David Hafler in the 70s. Extremely clean and solid for its power rating. Along with the many inputs it also supplies 3- AC outlets 2-switched with the power switch and the other outlet servers as a through AC outlet for use with other components.SpecificationsPower output: 25 watts per channel into 8? (stereo)Frequency response: 15Hz to 45kHzTotal harmonic distortion: 0.25%Input sensitivity: 1.65mV (MM), 125mV (line)Channel separation: 60dB (line)Semiconductors: 2 x IC, 2 x FET, 17 x transistors, 24 x diodesDimensions: 13-1/2 x 12 x 4-1/4 inchesWeight: 15lbs

Offered for sale is a manual for Instructions for Assembly Operation for the Dynaco SCA-50 Amplifier. This is a copy. 12 pages, in good condition with no writing or marks on the pages. Please review the pictures to see the condition.

(2ea. 400K + 2ea. 750K) Dynaco PAS-2 PAS-3 Tone Control Potentiometers. Used but top condition, pulled from a Dynaco PAS-3 Please also view my other items for sale. I can combine shipping if you purchase more than one item, simply add all your desired items to the cart, on the cart page, click the Request total and agree to the purchase items. If that doesnt work please let me know. As always, Duty and import/ Brokerage fees, taxes etc. are the buyers responsibility on delivery. Thanks for looking.

This is the legendary SCA-50 created by David Hafler in the 70s. Extremely clean and solid for its power rating. Along with the many inputs it also supplies 3- AC outlets 2-switched with the power switch and the other outlet servers as a through AC outlet for use with other components.SpecificationsPower output: 25 watts per channel into 8? (stereo)Frequency response: 15Hz to 45kHzTotal harmonic distortion: 0.25%Input sensitivity: 1.65mV (MM), 125mV (line)Channel separation: 60dB (line)Semiconductors: 2 x IC, 2 x FET, 17 x transistors, 24 x diodesDimensions: 13-1/2 x 12 x 4-1/4 inchesWeight: 15lbs

A classic configuration original DYNACO POWER CORD for original lover or Dynaco value enhancement project (Dynaco PAS preamplifier, ST-35, ST-70, SCA-35 amplifier) as pictured. Its pulled, in good clean condition (checked) Note: This beautiful classic configuration also suitable for Fisher, Pilot, Eico, Scott etc... vintage audio equipment and this selling is final (NO RETURN OR REFUND) Please buy or bid accordingly. Thanks for looking.

  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:    5750 6BE6W  DESIGNATION:                                             MADE FOR COLLINS RADIOS  YEAR:     1955 MONTH OR WEEK     JUNE Date code match    YES SILK SCREEN CONDITION %:                    100% MICA:    2 PLATES:    GREY GM %:     120% 122% SINGLE/PAIR/QUAD/MULTI:     PAIR GETTER:                                                          O GETTER                                    DATE:    6-55   NOS NIB    You will receive THIS PICTURED 1955 PAIR. This auction is for ONE PAIR.  THESE TUBES ARE NEW IN ORIGINAL BOXES. ALL TUBES ARE TESTED BEFORE THEY SHIP! 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