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2 X 12BH7A Sylvania Tubes Very Strong Pair NOS NIB Matching Codes 1967




Item History & Price

Information:
Reference Number: Avaluer:51332685Brand: SYLVANIA
Original Description:
4 x 12BH7A Sylvania Tubes

Made in USA

NOS

NIB
Matching codes (be-AEP) = May 1967

Tested on Enhanced Triplett E3444 Laboratory tester prepared by Paul Hart of Rosewell Ga.

3400/3120 micromhos @ 14.2/10.3 mA
2800/3340 micromhos @   8.1/11.5 mA
Bogey(100%) = 3100/3100 micromhos @ 11.5/11.5 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, ___-10.5___Volts bias 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.

00337


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