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2 X 12DT7 (12AX7 Sub) Amperex/Hytron Tubes Strong Matched Pair 1967 NOS




Item History & Price

Information:
Reference Number: Avaluer:51272352Type: Vacuum Tube
Brand: Amperex
Original Description:
2 x 12DT7(12AX7 sub) Amperex Tubes

Made in Holland for Hytron

Etched codes - delta 7A2 & 7B2 = 1967
NOS

NIB

See pictures as they are part of the description

Tested on enhanced Triplett E3444 by Paul Hart of Ga.

Results = 2120/1920 micromhos @ 1.84/1.47 mA
1920/2030 micromhos @ 1.47/1.82 mA
Bogey(100%) = 1600/1600  @ 1.2/1.2 ma +/- 10%

I do combine S&H

The measurements in this listing were taken on a Tri...plett 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, ___-2.0___Volts bias or Cathode resistance*


What were your tubes tested at?

I do combine S&H

00077


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