4 x 6SN7gtb Sylvania Tubes Made in USA Black plates Tall Boy Matching production codes(K5M) on all 1955 at the Emporium Pa. plant Matching Warranty codes on base - 944-639 ***The auction is for 4 tubes *** Tested on Enhanced Triplet E3444 Laboratory Tester Results =2450/2430 micromhos @ 6.5/6.3 mA 2320/2210 micromhos @ 5.9/5.1 mA2420/2380 micromhos @ 6.3/6.1 mA 2350/2300 micromhos @ 5.7/5.5 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_Volts plate, __250_Volts screen, ___-8.0___Volts bias or Cathode resistance What were your tubes tested? I do combine S&H

When ordering from the US, parcels may be subject to import tax and duty charges, which the buyer is responsible to pay.4 x 6SN7gta Sylvania Tubes Super Strong Quad 1955 Tall Boy #8This product data sheet is originally written in English.4 x 6SN7gta Sylvania TubesMade in USA Black platesTall BoyMatching production codes on all 1955 at the Emporium Pa. plant***The auction is for 4 tubes ***Tested on Enhanced Triplet E3444 Laboratory TesterResults =2500/2620 micromhos @ 6.9/7.4 mA2590/2440 micromhos @ 7.3/6.5 mA2730/2550 micromhos @ 8.9/6.8 mA2600/2560 micromhos @ 7.5/7.2 mABogey (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_Volts plate, __250_Volts screen, ___-8.0___Volts bias or Cathode resistanceWhat were your tubes tested?I do combine S&HThe 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 co Brand Sylvania Type Vacuum Tube Model 6sn7gta

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.4 X 6SN7gta Sylvania Tubes Super Fort Quad 1955 Grand Garçon #8Cette fiche produit est originalement écrite en anglais. Veuillez trouver ci dessous une traduction automatique en français. Si vous avez des questions veuillez nous contacter.4 tubes Sylvania 6SN7gtaFabriqué aux États-Unis Assiettes noiresGrand garçonCodes de production correspondants sur tous les 1955 à lusine Emporium Pa.*** Lenchère est pour 4 tubes ***Testé sur le testeur de laboratoire Enhanced Triplet E3444Résultats =2500/2620 micromhos à 6,9/7,4 mA2590/2440 micromhos à 7,3/6,5 mA2730/2550 micromhos à 8,9/6,8 mA2600/2560 micromhos à 7,5/7,2 mABogey (100 % ou nouveau) = 2 600/2 600 micromhos à 9,0/9,0 mA +/- 10 %Les mesures de cette liste ont été prises sur un Triplett 3444 modifié pour tester le tube en tant quamplificateur conformément aux spécifications RMA/EIA, utilisées par tous les fabricants de tubes américains et la plupart des fabricants étrangers. Ce testeur applique les conditions de test pour ce tube comme indiqué ci-dessous (y compris la tension précise du filament), puis mesure la transconductance (gm) conformément à la définition technique de gm. Les tubes peuvent également être utilisés dans les conditions dessai pendant de longues périodes pour sassurer quils sont stables. Un tube doit être testé de cette manière pour comparer ses résultats de test avec lintention initiale du fabricant ou avec dautres tubes du même type. La plupart des testeurs de tubes nappliquent pas les conditions de test requises ou neffectuent pas de test gm valide. Pour plus de détails sur le test et notre équipement de test, veuillez nous contacter.Les conditions de test pour cette liste sont__250_Plaque Volts, __250_Écran Volts, ___-8.0___ Polarisation des volts ou résistance de la cathodeQuels ont été vos tubes testés ?Je combine S&HLes mesures de cette liste ont été prises sur un Triplett 3444 modifié pour tester le tube en tant quamplificateur conformément aux spécifications RMA/EIA, utilisées par tous les fabricants de tubes américains et la plupart des fabricants étrangers. Ce testeur applique les conditions de test pour ce tube comme indiqué ci-dessous (y compris la tension précise du filament), puis mesure la transconductance (gm) conformément à la définition technique de gm. Les tubes peuvent également être utilisés dans les conditions dessai pendant de longues périodes pour sassurer quils sont stables. Un tube doit être testé de cette manière pour comparer ses résultats de test avec lintention initiale du fabricant ou avec dautres tubes du même type. La plupart des testeurs de tubes nappliquent pas les Brand Sylvania Type Vacuum Tube Model 6sn7gta

When ordering from the US, parcels may be subject to import tax and duty charges, which the buyer is responsible to pay.4 x 6SN7gta Sylvania Tubes Super Strong Quad 1955 Tall Boy #8This product data sheet is originally written in English.4 x 6SN7gta Sylvania TubesMade in USA Black platesTall BoyMatching production codes on all 1955 at the Emporium Pa. plant***The auction is for 4 tubes ***Tested on Enhanced Triplet E3444 Laboratory TesterResults =2500/2620 micromhos @ 6.9/7.4 mA2590/2440 micromhos @ 7.3/6.5 mA2730/2550 micromhos @ 8.9/6.8 mA2600/2560 micromhos @ 7.5/7.2 mABogey (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_Volts plate, __250_Volts screen, ___-8.0___Volts bias or Cathode resistanceWhat were your tubes tested?I do combine S&HThe 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 co Brand Sylvania Type Vacuum Tube Model 6sn7gta

Wenn Sie von dem US Marktplatz bestellen, können für die Pakete Steuern und Zollgebühren anfallen, die der Käufer später tragen muss.4 X 6SN7gta Sylvania Rohre Super Stark Quad 1955 Hoch Jungen #8Das Datenblatt dieses Produkts wurde ursprünglich auf Englisch verfasst. Unten finden Sie eine automatische Übersetzung ins Deutsche. Sollten Sie irgendwelche Fragen haben, kontaktieren Sie uns.4 x 6SN7gta Sylvania-RöhrenHergestellt in den USA Schwarze PlattenGroßer JungeÜbereinstimmende Produktionscodes bei allen 1955 im Werk Emporium Pa***Die Auktion bezieht sich auf 4 Röhren ***Getestet auf dem Enhanced Triplet E3444 LabortesterErgebnisse =2500/2620 Mikromhos bei 6,9/7,4 mA2590/2440 Mikromhos bei 7,3/6,5 mA2730/2550 Mikromhos bei 8,9/6,8 mA2600/2560 Mikromhos bei 7,5/7,2 mABogey (100 % oder neu) = 2600/2600 Mikromhos bei 9,0/9,0 mA +/- 10 %Die Messungen in dieser Auflistung wurden an einem modifizierten Triplett 3444 durchgeführt, um die Röhre als Verstärker gemäß den RMA/EIA-Spezifikationen zu testen, die von allen US-amerikanischen und den meisten ausländischen Röhrenherstellern verwendet werden. Dieser Tester wendet Testbedingungen für diese Röhre wie unten gezeigt an (einschließlich der genauen Filamentspannung) und misst dann die Transkonduktanz (gm) gemäß der technischen Definition von gm. Röhren können auch längere Zeit unter den Testbedingungen betrieben werden, um sicherzustellen, dass sie stabil sind. Eine Röhre muss auf diese Weise getestet werden, um ihre Testergebnisse mit der ursprünglichen Absicht des Herstellers oder mit anderen Röhren des gleichen Typs zu vergleichen. Die meisten Röhrentester wenden nicht die erforderlichen Testbedingungen an oder führen keinen gültigen gm-Test durch. Für weitere Details zum Test und zu unseren Testgeräten kontaktieren Sie uns bitte.Die Testbedingungen für diese Auflistung sind__250_Voltplatte, __250_Volt-Bildschirm, ___-8.0___Volt Bias oder KathodenwiderstandWelche Röhren wurden getestet?Ich kombiniere S&HDie Messungen in dieser Auflistung wurden an einem modifizierten Triplett 3444 durchgeführt, um die Röhre als Verstärker gemäß den RMA/EIA-Spezifikationen zu testen, die von allen US-amerikanischen und den meisten ausländischen Röhrenherstellern verwendet werden. Dieser Tester wendet Testbedingungen für diese Röhre wie unten gezeigt an (einschließlich der genauen Filamentspannung) und misst dann die Transkonduktanz (gm) gemäß der technischen Definition von gm. Röhren können auch längere Zeit unter den Testbedingungen betrieben werden, um sicherzustellen, dass sie stabil sind. Eine Röhre muss auf diese Weise getestet werden, um ihre Testergebnisse mit der ursprünglichen Absicht des Herstellers oder mit anderen Röhren des gleichen Typs zu vergleichen. Die meisten Röhrentester wenden nicht di Brand Sylvania Type Vacuum Tube Model 6sn7gta

4 x 6SN7gta Sylvania TubesMade in USA Black platesTall BoyMatching production codes on all 1955 at the Emporium Pa. plant***The auction is for 4 tubes ***Tested on Enhanced Triplet E3444 Laboratory TesterResults =2500/2620 micromhos @ 6.9/7.4 mA2590/2440 micromhos @ 7.3/6.5 mA2730/2550 micromhos @ 8.9/6.8 mA2600/2560 micromhos @ 7.5/7.2 mABogey (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_Volts plate, __250_Volts screen, ___-8.0___Volts bias or Cathode resistanceWhat were your tubes tested?I do combine S&HThe 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 co

4 x 6SN7gta Sylvania TubesMade in USA Black platesTall BoyMatching production codes on all 1955 at the Emporium Pa. plant***The auction is for 4 tubes ***Tested on Enhanced Triplet E3444 Laboratory TesterResults =2500/2620 micromhos @ 6.9/7.4 mA2590/2440 micromhos @ 7.3/6.5 mA2730/2550 micromhos @ 8.9/6.8 mA2600/2560 micromhos @ 7.5/7.2 mABogey (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_Volts plate, __250_Volts screen, ___-8.0___Volts bias or Cathode resistanceWhat were your tubes tested?I do combine S&HThe 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 co

2 x 6SN7gtb Sylvania Tubes Made in USA Black plates Chrome Dome Tested on Enhanced Triplet E3444 Laboratory Tester Results = See pictures for results Bogey (100%) = 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_Volts plate, __250_Volts screen, ___-8.0___Volts bias or Cathode resistance What were your tubes tested? I do combine S&H

2 x 6SN7gtb Sylvania Tubes Made in USA Black plates Tall Boy 1955 codes ***The auction is for 2 tubes*** Tested on Enhanced Triplet E3444 Laboratory Tester Results = 2200/2230 micromhos @ 5.3/5.5 mA 2250/2000 micromhos @ 5.8/4.8 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_Volts plate, __250_Volts screen, ___-8.0___Volts bias or Cathode resistance What were your tubes tested? I do combine S&H

2 x 6SN7gtb Sylvania Tubes Made in USA Black plates Tall Boy 1955 codes ***The auction is for 2 tubes*** Tested on Enhanced Triplet E3444 Laboratory Tester Results = 2570/2540 micromhos @ 7.2/6.7 mA 2650/2440 micromhos @ 8.4/7.8 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_Volts plate, __250_Volts screen, ___-8.0___Volts bias or Cathode resistance What were your tubes tested? I do combine S&H

TWO pairs (4 tubes ) NOS , NIB, , Sylvania JAN CHS 6SN7WGT, military issue,1955. New old stock coming directly from french Army. Placed in rolls by the french army services after peridical test (1974) All etched date codes of I5B . manufactured 02-1955 Can replace all your 6SN7GT and VT231 with strongest mechanical mounting Symetric black T-plates, reinforcing rods, brown micanol bases, chrome dome silvering Ruggedized version of the 6SN7GT.1956 date codes on base of 607 and 605for the yellow tagged tube . Strong 110 % to 120% test for All tubes On Calibrated TV7 : test tube #1 :92 and 96,tube #2 : 98 and 94 tube #3 : 92 and 96 tube #4 : 94 and 98 when theorical 100 % is 83

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.4 X 6SN7gtb Sylvania Tubes Très Fort Quad 1955 Grand Garçon #1Cette fiche produit est originalement écrite en anglais. Veuillez trouver ci dessous une traduction automatique en français. Si vous avez des questions veuillez nous contacter.4 tubes Sylvania 6SN7gtbFabriqué aux États-Unis Assiettes noiresGrand garçonCodes de production correspondants (K5M) sur tous les 1955 à lusine Emporium Pa.Correspondant à Garantie codes sur la base - 944-639*** Lenchère est pour 4 tubes ***Testé sur le testeur de laboratoire Enhanced Triplet E3444Résultats =2450/2430 micromhos à 6,5/6,3 mA2320/2210 micromhos à 5,9/5,1 mA2420/2380 micromhos à 6,3/6,1 mA2350/2300 micromhos à 5,7/5,5 mABogey (100 % ou nouveau) = 2 600/2 600 micromhos à 9,0/9,0 mA +/- 10 %Les mesures de cette liste ont été prises sur un Triplett 3444 modifié pour tester le tube en tant quamplificateur conformément aux spécifications RMA/EIA, utilisées par tous les fabricants de tubes américains et la plupart des fabricants étrangers. Ce testeur applique les conditions de test pour ce tube comme indiqué ci-dessous (y compris la tension précise du filament), puis mesure la transconductance (gm) conformément à la définition technique de gm. Les tubes peuvent également être utilisés dans les conditions dessai pendant de longues périodes pour sassurer quils sont stables. Un tube doit être testé de cette manière pour comparer ses résultats de test avec lintention initiale du fabricant ou avec dautres tubes du même type. La plupart des testeurs de tubes nappliquent pas les conditions de test requises ou neffectuent pas de test gm valide. Pour plus de détails sur le test et notre équipement de test, veuillez nous contacter.Les conditions de test pour cette liste sont__250_Plaque Volts, __250_Écran Volts, ___-8.0___ Polarisation des volts ou résistance de la cathodeQuels ont été vos tubes testés ?Je combine S&HLes mesures de cette liste ont été prises sur un Triplett 3444 modifié pour tester le tube en tant quamplificateur conformément aux spécifications RMA/EIA, utilisées par tous les fabricants de tubes américains et la plupart des fabricants étrangers. Ce testeur applique les conditions de test pour ce tube comme indiqué ci-dessous (y compris la tension précise du filament), puis mesure la transconductance (gm) conformément à la définition technique de gm. Les tubes peuvent également être utilisés dans les conditions dessai pendant de longues périodes pour sassurer quils sont stables. Un tube doit être testé de cette manière pour comparer ses résultats de test avec lintention initiale du fabricant ou avec dautres tubes du même type. La plupart des testeurs de tubes nappliquent pas les Brand Sylvania Type Vacuum Tube Model 6sn7gtb

A pair (2 tubes ) NOS , NIB,new in box, Sylvania JAN CHS 6SN7WGT, military issue,1955. New old stock coming directly from french Army. Good matched pairunder 3% difference Both etched date codes G5B, on top glass manufactured 07-1955 Original boxes retagged by french army at the at the peridical control (1963 and 1966) ,but in poor condition. Symetric black T-plates, reinforcing rods, brown micanol bases, chrome dome silvering Ruggedized version of the 6SN7GT.1955 date codes of 535 On GS-360P digital tube analyzer : New tube datas : 9 ma plate current, 2.6 ma/v transconductance TEST Results : TUBE #1 : Ia = 8.60 ma and S = 2.69 ma/V and Ia = 8.37 ma and S= 2.71ma/V TUBE #2 : Ia =8.80 ma and S = 2.72 ma/V and Ia = 8.90 ma and S= 2.73 ma/V On Calibrated TV7 : test tube #1 :94 and 94,tube #2 : 94 and 94 when theorical 100 % is 83

Number 6SN7 GTBManufacture SylvaniaBranded Sylvania Country USA Date 1955Getter DGM 2335 / 2220 & 2387 / 2282 Plate Black Triode 1 93.4 / 95.5Triode 2 88.8 / 91.3 Tested NOS (100 %) Up for your consideration is two closely matched 6SN7 USA vacuum tubes (black plate). The tubes are stamped Sylvania. The code on the tube 411 526 (411 is plant number) 526 = 1955 Sylvania Stamped.Made in the United States. black plates. The tubes were tested on a TV-7 tube tester that was calibrated professionally by Dan Nelson it has a digital meter. Pulled from a Allen tube organ . Listing for one pair onlyOn the TV 7 the minimum requirement rating is 50,50= 65% of the value of a new tube. Each unit of measurement on the Tv 7 for this tube =1.3 The Tubes tested at 100% (1.3 x 91 =118.3 %)

Number 6SN7 GTBManufacture SylvaniaBranded Sylvania Country USA Date 1955Getter DGM 2192 / 2152 & 2270 / 2252 Plate Black Triode 1 87.7 / 90.8Triode 2 86.1 / 90.1 Tested NOS (100 %) Up for your consideration is two closely matched 6SN7 USA vacuum tubes (black plate). The tubes are stamped Sylvania. The code on the tube 411 526 (411 is plant number) 526 = 1955 Sylvania Stamped.Made in the United States. black plates. The tubes were tested on a TV-7 tube tester that was calibrated professionally by Dan Nelson it has a digital meter. Pulled from a Allen tube organ . Listing for one pair onlyOn the TV 7 the minimum requirement rating is 50,50= 65% of the value of a new tube. Each unit of measurement on the Tv 7 for this tube =1.3 The Tubes tested at 100% (1.3 x 86 =111.5 %)

Number 6SN7 GTBManufacture SylvaniaBranded Sylvania Country USA Date 1955Getter DGM 2157 / 2130 & 2330 / 2202 Plate Black Triode 1 86.3 / 93.2Triode 2 85.2 / 88.1 Tested NOS (100 %) Up for your consideration is two closely matched 6SN7 USA vacuum tubes (black plate). The tubes are stamped Sylvania. The code on the tube 411 526 (411 is plant number) 526 = 1955 Sylvania Stamped.Made in the United States. black plates. The tubes were tested on a TV-7 tube tester that was calibrated professionally by Dan Nelson it has a digital meter. Pulled from a Allen tube organ . Listing for one pair onlyOn the TV 7 the minimum requirement rating is 50,50= 65% of the value of a new tube. Each unit of measurement on the Tv 7 for this tube =1.3 The Tubes tested at 100% (1.3 x 85 =110.5 %)

Number 6SN7 GTBManufacture SylvaniaBranded Sylvania Country USA Date 1955Getter DGM 2345 / 2285 & 2385 / 2337 Plate Black Triode 1 93.8 / 95.4Triode 2 91.4 / 93.5 Tested NOS (100 %) Up for your consideration is two closely matched 6SN7 USA vacuum tubes (black plate). The tubes are stamped Sylvania. The code on the tube 411 526 (411 is plant number) 526 = 1955 Sylvania Stamped.Made in the United States. black plates. The tubes were tested on a TV-7 tube tester that was calibrated professionally by Dan Nelson it has a digital meter. Pulled from a Allen tube organ . Listing for one pair onlyOn the TV 7 the minimum requirement rating is 50,50= 65% of the value of a new tube. Each unit of measurement on the Tv 7 for this tube =1.3 The Tubes tested at 100% (1.3 x 91 =118.3 %)