SYLVANIA JAN CHS 6SN7GT VT-231 Foil Getter Valve Tube (M211). Hickok 1-177-B = 1850/1825 mhos MC Hickok book = 1650/1650 No gas shorts grid emissions

This sale is for THREE (3) TUBES, aka Valves(UK), Lamps(EEU), Rohren(DE) Quantity THREE (3), Tested Very Strong Gm & mA , Date Coded A4 E5 K4 1944-45 Production, Model : SYLVANIA VT-231 JAN-CHS-6SN7GT MIL-SPEC TUBES - All 3 tubes have internal/external identical construction, Production dates A 4 E 5 K 4- 2 tested above average factory new for Gm&mA with Balanced Plates, 3rd Tube also just below ave factory new.- BLACK PLATES, Copper Support Rods- Tall Glass Envelopes- 6 sided Solid Metal Foil bottom Getter - Glass etched with Octangle Stop Sign inside 6SN7GT below A 4 & E 5 K 4- 270 degree circular bottom of glass flashing (Medium, Mu 20/20 Twin/Double Triodes)- A 4 & K 4 have white hot ink stamped on Black Micanol base SC966A inside rectangle- E 5 Tube has hot green inked stamped SC966A inside a rectangle . Believed to be a US Military contract #. - White & Green Ink hot stamped on black Micanol base VT-231 JAN-CHS-6SN7GT Sylvania(JAN=Joint Army/NavyCHS= Contract Hytron-Sylvania), Made in the U.S.A. SC966A - No Original Boxes, Tubes will ship in new Westinghouse boxes with a printed copy of this description and test results. Condition: Lightly Used but Tested above Average Factory new for Gm&mA ,Seller reconditioned: Cleaned Pins & Glass Plug-in and Play to Listen condition.RE-Tested Strong in uMhos Transconductance (Gm) & Anode Plate Current in mA. Both with Balanced Plates and above average factory new ratings when tested at 150VDC Plate Supply Voltage. Our Test bench: Dan Nelson recent (07/24/2023) Restored, Upgraded & Calibrated TV7D/U with Digital Meter reading Transconductance(Gm) and mA (Anode plate current). TEST RESULTS: (Tested at 150VDC Plate Supply Voltage) NO SHORTS, NO LEAKAGES, NO GAS, NO Apparent Micro-phonics detected. Min. Good (60-65% tube life)TV7 METER READING OF 50/50 = 1,250/1,250 uMhos Gm.Bogey = Pulled from 5 Vintage Manufacturers Factory Data sheet specs (RCA,GE,Sylvania-Hytron, BRIMAR & Tung-Sol) for VT-231 6SN7GT tube type when tested as a Single Tube at Plate Supply Voltage of 250Voltsin Class A1 operations states Average Operating Characteristics NOS tube will test at 2,600/2,600 uMhos (Gm) at 9.0/9.0 mA Anode Plate Current. When Tested at a range of 100VDC-150VDC Plate Supply Voltage( All TV7 versions test at 150VDC Plate supply voltage)a VT-231 JAN-CRC-6SN7GT will test Factory NOS on average 2,500/2,500 Gm at 10.0/10.0 mA. (Where 2,500/2,500 uMhos (Gm) = TV7 Meter reading of 100/100. Tube 1: ( Date Code A 4 Jan 1944) ( 103/105% Gm, >100% plate current emissions) Plate 1: 103.0 = 2,575.0 uMhos(Gm) at 12.7 mA (Anode Plate Current) Place 2: 104.9 = 2,622.5 uMhos(Gm)at 12.9 mA (Anode Plate Current) Tube 2: ( Date Code E 5 May 1945 ) ( 112/112% Gm, >100% plate current emissions) Plate 1: 112.2 = 2,805.0 uMhos at 13.8 mA (Anode Plate Current) Plate 2: 112.8 = 2,820.0 uMhos at 14.0 mA (Anode Plate Current) Tube 3: ( Date Code K 4 Nov. 1944) ( 94-97% Gm, >100% plate current emissions) Plate 1: 97.1 = 2,427.5 uMhos at 12.1 mA (Anode Plate Current) Plate 2: 93.8 = 2,345.0 uMhos at 11.7 mA (Anode Plate Current) *** WE COMBINE SHIPPING on Multiple Tube Purchases for USA Shipping which SAVES $ on Shipping Costs which We refund at time of Payment. Contact us before you buy if you are International Customer for multiple purchased to be combined into One Box as we must make a new listing with all the items you want. WE PACK VERY WELL AND SHIP VERY FAST (one day or same day)ALL USA Locations : Low cost Shipping USPS Advantage (old 1st class ground/space available air) Low cost International shipping via eBay International Economy small package Service space available AIR-FREIGHT(allow 10days to 6weeks for delivery depending upon which World region box is delivered to). The Americas and Europe are fast.ASIA 2nd fastest. Austrialia /NZ / Pacific Islands about 3-4weeks delivery. West Asia/Middle East allow 6weeks.

2 Vintage Used 1940s WWII SYLVANIA JAN-CHS-6SN7GT VT-231 Tubes, They Both Tested Fantastic On A Jackson 648 Tester. No Leakage Or Shorts. Closely Balanced Tubes, Might Be A Matched Set. They Have Matching Code Dates. No Boxes As They Were In Terrible Shape. Great Testing Tubes. Legandary 2 Hole BAD BOY Tubes. The Tube Tester Results Are Very Accurate, Test The Same On Both Plates On Both Tubes.

Beautiful pair of Sylvania JAN CHS 6SN7GT tubes, dual marked with the VT-231 designation, as many military versions of the era were. Matched to about 8% difference. Medium glass bottle, identical 1945 date codes. I ship worldwide directly via USPS and UPS. Buyers from mainland China and Italy: please contact me for shipping cost. NumberJAN CHS 6SN7GT / VT-231 Brand on tubeSylvaniaActual manufacturerSylvania Country of manufactureUSA Date codesE5 (both) Box typeWhite boxes Plate styleBlack Getter styleBottom Glass styleClear Base styleOctal Test results (measured , typical NOS)2400/2350 & 2450/2550 typical NOS is 2600/2600 Be sure to read my policies below, and contact me before you purchase if you have any questions. I have over 30 years of experience as an electronics engineer, certified electronics technician, and hobbyist, and have been collecting, buying, and selling tubes since the 1980s. Ive been an eBay seller since February of 2000. This is the only seller account I have on eBay and the pictures you see are of the actual tube(s) you’ll receive. Tubes are described, tested, and presented to the best of my ability, subject to the limitations of the equipment that I have available (Hickok 539C and 6000A). Test results are likely to differ between your equipment and mine due to many factors. Tubes are not tested for noise or microphonics. Do you have tubes to sell? Contact me with your inventory!Return Policy Unless otherwise stated in this listing, tubes may be returned within 30 days for a refund. Please keep in mind that while I do allow returns, my purpose here is to sell tubes, not to loan tubes for rolling. Any tube to be returned must: a) still bear my identification stamp. b) be in EXACTLY the same condition in which it arrived to you. Things which may invalidate a return: defaced or smudged print on the glass, bases scratched from retainer springs, cracked or damaged glass, damaged or missing boxes (where original boxes were sent with the tubes), and electrical or physical degradation from improper operation or handling. Returns which do not meet the above criteria may be refused or may be subject to partial refund. Ebays return guidelines prohibit “using or damaging an item and then returning it.” I pay for return shipping on all returns within the USA, regardless of reason. You pay for return shipping if you are located outside of the USA. If the tube arrives to you DOA or significantly not as described (SNAD) I pay for return shipping. I do not pay for return shipping for any other reason. If a tube is returned as DOA or SNAD, but does not test as such upon return, I reserve the right to be reimbursed for any return shipping cost that I paid. International buyers, please note: Import fees and taxes which you pay to your border and/or customs agency are not refundable by me under ANY conditions or for ANY reason, regardless of the reason for your return.Shipping Your tubes will be professionally prepared for shipping using all-new packing materials and will arrive to you in perfect condition. Ive been shipping tubes for many years and know how to get them to you quickly and securely. International orders ship with proper customs documentation and tariff codes to ensure that theyre processed with minimal delay upon arrival in the destination country. DOMESTIC: Unless otherwise noted, free shipping is offered on all tubes purchased with Buy-It-Now. Orders that total $400 or less are generally shipped via the USPS Ground Advantage service, while orders exceeding that value are shipped via USPS Priority Mail. Other services are available at additional cost. If you prefer a shipping method that is not listed, please contact me prior to purchasing. I can usually ship via any USPS, FedEx, or UPS method that is applicable to your ZIP code. If you need expedited shipping (Express, Next Day, etc.) please contact me first to confirm earliest available date of shipment, as cutoff times are generally early in the afternoon. INTERNATIONAL: USPS First Class Mail: This is the least expensive option but the availability of tracking is limited in many cases. Its available worldwide for packages with a value of USD$400 or less. Be aware that First Class Mail has been known to take up to three months to reach some destinations. Customs delays are also more common with First Class. If you select the First Class option I expect that you will be patient and wait three months before requesting a refund for “item not received.” If you require faster delivery please select an option below. USPS Priority Mail: This option is available for shipments with a value less than USD$1000. It typically takes a couple of weeks to reach most destinations. UPS Worldwide Expedited: This option is available worldwide for all shipments, and is required for shipments valued at USD$1000 or more. It is fast and reliable, with end-to-end tracking. I can also usually arrange shipping with other carriers at additional cost. Please inquire before purchasing if you have specific requests. I ship to China and Italy only via UPS Worldwide Expedited, regardless of value. No exceptions. I dont use eBays in-house International Shipping program, as the cost tends to be much higher than shipping directly with a carrier.USPS requires that all addresses be in “Latin” (abcdefg) characters (this means, for example, no Cyrillic (???????) or Chinese (???), etc.). USPS will return to the me any packages which violate this guideline, and the buyer will then be required to correct the address and pay postage again. Ebay places the burden of safe delivery on sellers, so I fully insure all shipments sent outside of the USA, regardless of value. Because I can insure only up to the declared value, ALL SHIPMENTS ARE DECLARED AT ACTUAL VALUE. You might owe significant import fees on higher value shipments once they cross your countrys border – check with your border or customs agency for details. I can ship to a domestic freight forwarder or other third party within the USA, provided their address is on the order at the time you place it. GENERAL: SIGNATURE REQUIREMENT: All orders valued at USD$750 or greater, and ANY order shipped via UPS or FedEx, automatically require a signature release upon delivery. Someone at your delivery address will need to be available at the time of delivery to sign for the package. COMBINED SHIPPING: Im happy to combine shipping on multiple purchases. Those shipping within the US will combine automatically. International orders must be manually combined after the purchase, and any excess shipping will be refunded to your payment source (due to the way eBay buy-it-now items are set up, this is the only way I can combine shipping on more than one item). HANDLING TIME: My handling time is one business day and eBay requires me to ship within that timeframe. I cannot withhold shipment for a later date. If you require shipment on a specific date I can often set up a special listing just for you on that date; please inquire. I usually ship every day of the week, except for Sunday and USPS-observed holidays, and orders often ship same day. Orders placed later in the day usually ship next business day. Orders placed on Friday or Saturday will sometimes not ship until Monday. All orders placed on Sunday or USPS-observed holidays ship the next business day. Expedited and express shipments (FedEx and UPS 2-day & Next Day, etc) must be placed by 12PM Pacific Time in order to ship same day. If you have an urgent delivery need its a good idea to contact me first so I can confirm exact day of shipment. SHIP-TO ADDRESS: Ebay requires that I ship to the address on the order. This protects both you and me. I cannot ship to a different address. If you require shipment to a different address please update your shipping information before making a purchase. R31

Beautiful pair of Sylvania JAN CHS 6SN7GT tubes, dual marked with the VT-231 designation, as many military versions of the era were. Matched to about 8% difference. Medium glass bottle, identical 1945 date codes. Buyers from mainland China (not including Hong Kong): due to excessive losses and delays within your postal system, I will ship to you only via UPS. You must select UPS (not USPS) from the shipping options when you purchase. NumberJAN CHS 6SN7GT / VT-231 Brand on tubeSylvaniaActual manufacturerSylvania Country of manufactureUSA Date codesE5 (both) Box typeWhite boxes Plate styleBlack Getter styleBottom Glass styleClear Base styleOctal Test results (measured , typical NOS)2400/2350 & 2450/2550 typical NOS is 2600/2600 Be sure to read my policies below, and contact me before you purchase if you have any questions. I have over 30 years of experience as an electronics engineer, certified electronics technician, and hobbyist, and have been collecting, buying, and selling tubes since the 1980s. Ive been an eBay seller since February of 2000. This is the only seller account I have on eBay and the pictures you see are of the actual tube(s) you’ll receive. Tubes are described, tested, and presented to the best of my ability, subject to the limitations of the equipment that I have available (Hickok 539C and 6000A). Test results are likely to differ between your equipment and mine due to many factors. Tubes are not tested for noise or microphonics. Do you have tubes to sell? Contact me with your inventory!Return Policy Unless otherwise stated in this listing, tubes may be returned within 30 days for a refund. Please keep in mind that while I do allow returns, my purpose here is to sell tubes, not to loan tubes for rolling. Any tube to be returned must: a) still bear my identification stamp. b) be in EXACTLY the same condition in which it arrived to you. Things which may invalidate a return: defaced or smudged print on the glass, bases scratched from retainer springs, cracked or damaged glass, damaged or missing boxes (where original boxes were sent with the tubes), and electrical or physical degradation from improper operation or handling. Returns which do not meet the above criteria may be refused or may be subject to partial refund. Ebays return guidelines prohibit “using or damaging an item and then returning it.” I pay for return shipping on all returns within the USA, regardless of reason. You pay for return shipping if you are located outside of the USA. If the tube arrives to you DOA or significantly not as described (SNAD) I pay for return shipping. I do not pay for return shipping for any other reason. If a tube is returned as DOA or SNAD, but does not test as such upon return, I reserve the right to be reimbursed for any return shipping cost that I paid. International buyers, please note: Import fees and taxes which you pay to your border and/or customs agency are not refundable by me under ANY conditions or for ANY reason, regardless of the reason for your return. Shipping Your tubes will be professionally prepared for shipping using all-new packing materials and will arrive to you in perfect condition. Ive been shipping tubes for many years and know how to get them to you quickly and securely. International orders ship with proper customs documentation and tariff codes to ensure that theyre processed with minimal delay upon arrival in the destination country. DOMESTIC: Unless otherwise noted, free shipping is offered on all tubes purchased with Buy-It-Now. Orders that weigh 16 oz. or less and which total $400 or less are generally shipped via the USPS First Class Package service, while orders exceeding either of those values are shipped via USPS Priority Mail. Other services are available at additional cost. If you prefer a shipping method that is not listed, please contact me prior to purchasing. I can usually ship via any USPS, FedEx, or UPS method that is applicable to your ZIP code. If you need expedited shipping (Express, Next Day, etc.) please contact me first to confirm earliest available date of shipment, as cutoff times are generally early in the afternoon. INTERNATIONAL: USPS First Class Mail: This is the least expensive option but the availability of tracking is limited in many cases. Its available worldwide for packages with a value of USD$400 or less. Be aware that First Class Mail has been known to take up to three months to reach some destinations. Customs delays are also more common with First Class. If you select the First Class option I expect that you will be patient and wait three months before requesting a refund for “item not received.” If you require faster delivery please select an option below. USPS Priority Mail: This option is available for shipments with a value less than USD$1000. It typically takes a couple of weeks to reach most destinations. UPS Worldwide Expedited: This option is available worldwide for all shipments, and is required for shipments valued at USD$1000 or more. It is fast and reliable, with end-to-end tracking. I can also usually arrange shipping with other carriers at additional cost. Please inquire before purchasing if you have specific requests. I no longer ship to Italy. I ship to China only via UPS Worldwide Expedited, regardless of value. No exceptions. Orders valued in excess of USD$2000 may be shipped in multiple packages. Dont put too much faith in eBay delivery estimates for international shipments. They are often wrong by a considerable amount. I dont use eBays Global Shipping Program (GSP) because they treat tubes as hazardous material and will confiscate them.USPS is now requiring that all addresses be in “Latin” (abcdefg) characters (this means, for example, no Cyrillic (???????) or Chinese (???), etc.). USPS will return to the me any packages which violate this guideline, and the buyer will then be required to correct the address and pay postage again. Ebay places the burden of safe delivery on sellers, so I fully insure all shipments sent outside of the USA, regardless of value. Because I can insure only up to the declared value, ALL SHIPMENTS ARE DECLARED AT ACTUAL VALUE. You might owe significant import fees on higher value shipments once they cross your countrys border – check with your border or customs agency for details. I can ship to a domestic freight forwarder or other third party within the USA, provided their address is on the order at the time you place it. GENERAL: SIGNATURE REQUIREMENT: All orders valued at USD$750 or greater, and ANY order shipped via UPS or FedEx, automatically require a signature release upon delivery. Someone at your delivery address will need to be available at the time of delivery to sign for the package. COMBINED SHIPPING: Im happy to combine shipping on multiple purchases. Those shipping within the US will combine automatically. International orders must be manually combined after the purchase, and any excess shipping will be refunded to your payment source (due to the way eBay buy-it-now items are set up, this is the only way I can combine shipping on more than one item). HANDLING TIME: My handling time is one business day and eBay requires me to ship within that timeframe. I cannot withhold shipment for a later date. If you require shipment on a specific date I can often set up a special listing just for you on that date; please inquire. I usually ship every day of the week, except for Sunday and USPS-observed holidays, and orders often ship same day. Orders placed later in the day usually ship next business day. Orders placed on Friday or Saturday will sometimes not ship until Monday. All orders placed on Sunday or USPS-observed holidays ship the next business day. Expedited and express shipments (FedEx and UPS 2-day & Next Day, etc) must be placed by 12PM Pacific Time in order to ship same day. If you have an urgent delivery need its a good idea to contact me first so I can confirm exact day of shipment. SHIP-TO ADDRESS: Ebay requires that I ship to the address on the order. This protects both you and me. I cannot ship to a different address. If you require shipment to a different address please update your shipping information before making a purchase. R28

Sylvania JAN CHS 6SN7GT VT231 Black Base/Clear Glass..

Les commandes réalisées à partir des États-Unis, peuvent être soumises à des taxes dimportation et droits de douane, que lacheteur est tenu responsable de payer.SYLVANIA Jan 6SN7GT Tube Argent Bullets Lourd Chromé Papier Alu Assorti Set NeufCette fiche produit est originalement écrite en anglais. Veuillez trouver ci dessous une traduction automatique en français. Si vous avez des questions veuillez nous contacter.SYLVANIE JUNN CHS 6SN7GTLÉGENDAIRE 1949 CHIENS DIFFICILESBALLES DARGENTU.S UNRMOui TRANSMISSIONSLOURD FEUILLE CHROMÉEBAS D GETTERPLAQUES ÉCHELLE NOIRES 2 TROUSPLATEAU RECTANGULAIRE EN MICAENSEMBLE PARFAITEMENT ASSORTIExtrêmement rare(Navires dans *Boîtes de Reproduction)??? Incroyables tubes militaires historiques ???U.S UNRMOui  U.S NUNVOui  JUNN  Tubes de spécifications militairesAnnée de fabrication : 1949Codes correspondants : 940 I8ABase noire hauteVert Étiquette militaireEnsemble de Deux (2)Fabriqué dans le U.SUN.??? Ces tubes sont Très rare dans Tout neuf Condition ??? LES MEILLEURS TUBES SUR LE MARCHÉ... PAS DE SHORT... PAS DE FUITES...??? HICKOK TESTÉ ???Testé sur Hickok 750 pour Émission, conductance mutuelle Où 50mA est Bien ces tubes semboîtent 68/75 pour ÉmissionOù 2 600 ?A est Bien ces tubes semboîtent 2 600/3 000 pour Conductance mutuelleTube 1. 72/75 mA - 3 000/3,000 ?A  au ralentiTube 2. 68/68 mA - 2 600/2 900 ?A  au ralentiJoliment équilibré - Rare et exceptionnel - Gamme tonale complèteEXCLTUBES USIFS HAUTE FIDÉLITÉTout mon inventaire de tubes est emballé et soigneusement testé...  *Les cotes de test sont spécifiques à Mon équipement de test entièrement calibré !  Les tubes sont passés dans un Essai de vie et chaque plaque est chauffée et mesurée pour les émissions, les fuites et les courts-circuits ! Chaque tube est soigneusement inspecté, ils sont décrits avec précision et répertoriés en fonction de leur juste valeur...    Tous les tubes fabriqués émettent un certain type de son, bourdonnement ou léger microphonique ! Les tubes bruyants seraient toujours vendus aux enchères ou jetés...  Je marque chaque tube afin déviter que le tube ne roule !  Les variations de la sortie de ligne et de léquipement de test excluent toute réclamation concernant les résultats de test correspondants sur tout équipement autre que le mien...  *Les résultats des tests de différents équipements de test NE SONT PAS garantis ! Bienvenue aux acheteurs internationaux ! Jutilise eBay Global et USPS 1st Class International exclusivement, sauf indication contraire... Je ne suis pas en mesure de modifier la valeur déclarée sur les formulaires douaniers, et les acheteurs internationaux sont responsables de toutes les taxes, douanes et frais supplémentaires !  Chaque tube est entièrement assuré, emballé et expédié en toute sécurité...  ? *Honnêteté, *Fiabilité et *Lintégrité est *Tout ?Tous les tubes fabriqués émettent un certain type de son, bourdonnement ou léger microphonique ! Les tubes bruyants seraient toujours vendus aux enchères ou jetés...  Je marque chaque tube afin déviter que le tube ne roule !  Les variations de la sortie de ligne et de léquipement de test excluent toute réclamation concernant les résultats de test correspondants sur tout équipement autre que le mien...  *Les résultats des tests de différents équipements de test NE SONT PAS garantis ! Bienvenue aux acheteurs internationaux ! Jutilise eBay Global et USPS 1st Class International exclusivement, sauf indication contraire... Je ne suis pas en mesure de modifier la valeur déclarée sur les formulaires douaniers, et les acheteurs internationaux sont responsables de toutes les taxes, douanes et fr Brand SYLVANIA Country/Region of Manufacture United States Vacuum Tube Hi Fi Radio Tube Valve Model JAN 6SN7 GT Type Preamp Tubes

Two, Sylvania JAN CHS 6SN7GT. Black, 3 rivet, T-plates, the real Bad Boy. Tested on a Hickok TV-3 military tester that has been calibrated. Firm bases, green printed logos, excellent silvering. Tubes are matched for dynamic gain and structure- test at 3250-3250, 3250-3125 where pass/fail is 1625 micromho. The tubes have the same structure inside and out, having date codes 304 and 247, the 4th week of 1953 and the 47th week of 1952. Many other lots of tubes for sale this week. Shipping is free within the continental US. Elsewhere- exact postage only, no packing fee.

2 Vintage Used 1940s WWII SYLVANIA JAN-CHS-6SN7GT VT-231 Tubes, They Both Tested Fantastic On A Jackson 648 Tester. No Leakage Or Shorts. Closely Balanced Tubes, Might Be A Matched Set. They Have Matching Code Dates. No Boxes As They Were In Terrible Shape. Great Testing Tubes. Legandary 2 Hole BAD BOY Tubes. The Tube Tester Results Are Very Accurate, Test The Same On Both Plates On Both Tubes.

2 Sylvania 6SN7GT/VT231 Tubes,pair USA JAN manufacture-1 NIB-1 white boxed--TV7 tested-test nil for shorts TV7 tested : 50/50 is minimum TEST : 102/100 and 100/100 WILL COMBINE SHIPPING ON MULTIPLE AUCTION AND STORE PURCHASES

2 x JAN-CHS-6SN7gt Sylvania Tubes Made in USA 3-hole Black Plates VT-231 = Military Specifications Matching production codes E2M = 1952 Emporium PA. plant Matching Warranty codes - 238 Tested on enhanced Triplet E3444 Laboratory Tester by Paul Hart of Ga. Results = 2450/2550 micromhos @ 7.7/7.9 mA 2450/2500 micromhos @ 8.2/8.2 mA Bogey(100% or New) = 2600/2600 micromhos @ 9.0/9.0 mA +/- 10% The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers. This tester applies test conditions for this tube as shown below (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us.The test conditions for this listing are__250_V plate, __250_V screen, ___-8___Vbias or Cathode resistance What were your tubes tested at?I do combine S&H

2 x JAN-CHS-6SN7gt Sylvania Tubes Made in USA 2-hole Black Plates VT-231 = Military Specifications US Navy Tested on enhanced Triplet E3444 Laboratory Tester by Paul Hart of Ga. Results = 2810/2760 micromhos @ 9.7/9.2 mA 2690/2670 micromhos @ 8.5/9.2 mA - missing guide pin, but marked Bogey(100% or New) = 2600/2600 micromhos @ 9.0/9.0 mA +/- 10% The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers. This tester applies test conditions for this tube as shown below (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us.The test conditions for this listing are__250_V plate, __250_V screen, ___-8___Vbias or Cathode resistance What were your tubes tested at?I do combine S&H

2 x JAN-CHS-6SN7gt Sylvania Tubes Made in USA 2-hole Black Plates VT-231 = Military Specifications Tested on enhanced Triplet E3444 Laboratory Tester by Paul Hart of Ga. Results = 2430/2580 micromhos @ 7.5/8.1 mA 2450/2500 micromhos @ 6.7/8.2 mA Bogey(100% or New) = 2600/2600 micromhos @ 9.0/9.0 mA +/- 10% The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers. This tester applies test conditions for this tube as shown below (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us.The test conditions for this listing are__250_V plate, __250_V screen, ___-8___Vbias or Cathode resistance What were your tubes tested at?I do combine S&H

PERFECT NOS MATCHED PAIR 6SN7GT / VT-231 HIGH GRADE SYLVANIA VINTAGE TUBES . BOTH TUBES 100% GUARANTEED NEW OLD STOCK PERFECT IN EVERY WAY YOU GTE THE 2 TUBES ONE ORIGINAL BOX & ONE GENERIC BOX FOR THE PRICE BOTH TUBES MADE THE EXACT SAME DESIGN AND PLATE STRUCTURE . MADE WITH BLACK SQUARE PLATES . THESE 2 HOLE BADBOY STLE PLATE TUBES WILL SOUND FANTASTIC RARE TO FIND A PERFECT MATCHED PAIR IN NEW CONDITION FROM THIS ERA MADE IN THE EARLY 1950S IN THE USA THEY HAVE FOIL GETTERS

1960s Matched Pair JAN CHS 6SN7WGTA Sylvania Tube Vintage USA 6SN7GT. In great shape. Tested. Low noise and microphonics.

No original tube box. Tested using Hickok 533. Please request combined shipping for multiple items.

Hello all, here we have a decent pair of USA made 6SN7GT double triode valves / tubes, as used in so many amplifiers. Both from the same batch and identical construction. Sylvania JAN-CHS VT-231 types. They test at gm 2.6/2.7 and 2.9/3.0 mA/V Clear glass type. Items will be very well packed for delivery. Thanks for looking. Past Times Radio

Valve Amplifier Sylvania Jan 6SN7GT Valves Tubes x3. For sale are the above Valves, Fully working, I am selling some of my valves that are just collecting dust, so please look at my other items Collection in person welcomed

6SN7 / VT-231 Sylvania 6SN7 JAN-CRS-6SN7GT MADE IN USA TESTED CLEAR GLASSTESTED AN AMPLITREX AT1000Black holed plates Eg1 spec 8.0v gm spec 2.60 ma/vEg1 meas 7.7v gm meas 2.70 ma/v 96% Emis 103%gmEg1 meas 7.3v gm meas 2.70 ma/v 91% Emis 103%gmI will combine shipping if you buy more than one valve!

VT-231 Sylvania 6SN7 JAN-CRS-6SN7GT 4C MADE IN USA MILITARY CLEAR GLASSTESTED AN AMPLITREX AT1000Black holed plates Eg1 spec 8.0v gm spec 2.60 ma/vEg1 meas 7.8v gm meas 2.80 ma/v 78% Emis 100%gmEg1 meas 7.5v gm meas 2.70 ma/v 86% Emis 103%gmI will combine shipping if you buy more than one valve!

VT-231 Sylvania 6SN7 JAN-CRS-6SN7GT A3 MADE IN USA SC963A TESTED CLEAR GLASSTESTED AN AMPLITREX AT1000Black holed plates Eg1 spec 8.0v gm spec 2.60 ma/vEg1 meas 7.3v gm meas 2.68 ma/v 91% Emis 103%gmEg1 meas 8.1v gm meas 2.50 ma/v 101% Emis 96%gmI will combine shipping if you buy more than one valve!

VT-231 Sylvania 6SN7 JAN-CRS-6SN7GT C4 MADE IN USA SC966A TESTED CLEAR GLASSTESTED AN AMPLITREX AT1000Black holed plates Eg1 spec 8.0v gm spec 2.60 ma/vEg1 meas 7.8v gm meas 2.80 ma/v 97% Emis 107%gmEg1 meas 7.5v gm meas 2.70 ma/v 93% Emis 103%gmI will combine shipping if you buy more than one valve!

VT-231 Sylvania 6SN7 JAN-CRS-6SN7GT K4 SC966 MADE IN USA MILITARY CLEAR GLASSTESTED AN AMPLITREX AT1000Black holed plates Eg1 spec 8.0v gm spec 2.60 ma/vEg1 meas 7.9v gm meas 2.50 ma/v 98% Emis 96%gmEg1 meas 7.6v gm meas 2.70 ma/v 95% Emis 103%gmI will combine shipping if you buy more than one valve!

Je vous propose ces quatre SYLVANIA VT-231 JAN-CHS-6SN7GT Fabriqués aux U.S.A. en 1945 pour lU.S. ARMY-NAVY Les tubes sont 100% inutilisésExpédiés dans une boite brune neuveTestés sans ronflement ni microphonie sur un préampli Mexing MC7R-II et sur un intégré 2E22 BEZ T3A-42 sur des JBL 2445/E140/4560 Mesurés sur lampemètre électronique Duovac :Anode : 250VGrille : - 8V 9mA = 100% Tube 1 : 9,9mA et 8,5mA Tube 2 : 9mA et 8,1mA Tube 3 : 8,5mA et 9,7mA Tube 4 : 8,3mA et 9,2mA SYLVANIA VT-231 JAN-CHS-6SN7GT Made in U.S.A. for U.S. ARMY - NAVY Same date code C5 : 1945 Same structure inside and out Firm basesSupplied in new brown box They are tested on a Duovac digital tube tester Anode : 250V Grid : - 8V 9mA = 100%Tube 1 : 9,9mA and 8,5mA Tube 2 : 9mA and 8,1mA Tube 3 : 8,5mA and 9,7mA Tube 4 : 8,3mA and 9,2mAThoses valves has also been tested on a Mexing MC7R-II preamp and a 2E22 BEZ T3A-42 amplifier on JBL 2445/E140/4560 with no hum or microphonics that can be heard NOS, the tubes are 100% unused EXPEDITION FRANCE : 11€ en Colissimo contre signature SHIPPING EUROPEAN UNION : 15€ Colissimo tracked and signed