2 X 12ax7 Amperex Tubes Very Strong Pair Long Plate Foil D 1958 MC6 2 Pair Avail
Item History & Price
| Reference Number: Avaluer:7136834 | Brand: Amperex |
4 x 12ax7 Amperex Tubes
Made in Holland
Foil D Getters
Matching Etched Codes = mC6/Delta 8J = 1958
Tested on Enhanced Triplett E3444 Labortory Tester
Pair # 1
1620/1770 micromhos @ 1.23 & 1.51 mA
1590/1790 micromhos @ 1.16 & 1.65 mA =SOLD
Pair # 2
1580/1620 micromhos @ 1.03 & 1.12 mA
1660/1710 micromhos @ 1.20 & 1.25 mA
Bogey(100%) = 1600/1600 micromhos @ 1.2/1.2 mA +/- 10%
***There are more avail...able***
I do combine S&H
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, ___-2___Vbias or Cathode resistance
What were your tubes tested at?
S&H to China, Italy and a few other countries will require a Tracking # and will cost a minimum of $31, depending on weight.
00066
Made in Holland
Foil D Getters
Matching Etched Codes = mC6/Delta 8J = 1958
Tested on Enhanced Triplett E3444 Labortory Tester
Pair # 1
1620/1770 micromhos @ 1.23 & 1.51 mA
1590/1790 micromhos @ 1.16 & 1.65 mA =SOLD
Pair # 2
1580/1620 micromhos @ 1.03 & 1.12 mA
1660/1710 micromhos @ 1.20 & 1.25 mA
Bogey(100%) = 1600/1600 micromhos @ 1.2/1.2 mA +/- 10%
***There are more avail...able***
I do combine S&H
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, ___-2___Vbias or Cathode resistance
What were your tubes tested at?
S&H to China, Italy and a few other countries will require a Tracking # and will cost a minimum of $31, depending on weight.
00066
