2 x 12au7a Sylvania/Baldwin Tubes*Long Grey Plates*VS Bogie +*(15 Pair Avail)

Description

2 x  12AU7A Sylvania Tubes
Made in USA for Baldwin
Long Ribbed Grey plates
O getter
Matching codes 312
Pictures show actual
The auction is for 2 (two) tubes and there are several pair available
Tested on Enhanced Tripplet E3444 Laboratry Tester prepared by Paul Hart
All tubes will test 2200/2200 or higher
Bogey(100%) = 2200/2200
micromhos @ 10.0/10.0 mA +/- 10%
I do combine S&H
READ THIS:
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 trans-conductance (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, ___
-8.5
___Volts bias or Cathode resistance
*
Most other testers CANNOT test tubes using the proper specifications and make up their own test results
What were your tubes tested at?