1 X JAN - 12SN7gt Tungsol (USA) Tube Black Glass 1949 US NAVY
Item History & Price
| Reference Number: Avaluer:7425093 | Type: Vacuum Tube |
| Brand: Tungsol |
1 x 12SN7gt Tungsol Tube
Made in USA for US Navy
Black Glass
Tested on Enhanced Triplet E3444 Laboratory Tester by Paul Hart of Roswell Ga.
2210/2370 micromhos @ 7.4 & 8.0 mA
Bogey (100%) = 2600/2600 micromhos @ 9.0/9.0 mA +/- 10%
Ask any questions before buying, not after
The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA spec...ifications, 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*
S&H to China, Italy and a few other countries will require a Tracking # and will cost a minimum of $31, depending on weight.
00048
Made in USA for US Navy
Black Glass
Tested on Enhanced Triplet E3444 Laboratory Tester by Paul Hart of Roswell Ga.
2210/2370 micromhos @ 7.4 & 8.0 mA
Bogey (100%) = 2600/2600 micromhos @ 9.0/9.0 mA +/- 10%
Ask any questions before buying, not after
The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA spec...ifications, 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*
S&H to China, Italy and a few other countries will require a Tracking # and will cost a minimum of $31, depending on weight.
00048
