Description: 2 x 12AU7A Sylvania Tubes Made in USA for Conn Long Grey plates O getter Lettering may be smudged/missing Matching codes 312-439 = 1964 The auction is for 2 tubes Tested on Enhanced Tripplet E3444 Laboratry Tester prepared by Paul Hart Results = 2340/2550 micromhos @ 10.7/11.7 mA 2530/2350 micromhos @ 11.6/10.4 mA Bogey(100% or new) = 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?
Price: 30 USD
Location: Morganville, New Jersey
End Time: 2024-09-20T18:54:34.000Z
Shipping Cost: 7.75 USD
Product Images
Item Specifics
Restocking Fee: 20%
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Brand: SYLVANIA
Model: 12au7a
