Citronic

4 x 12au7 RCA Tubes*Black Plates -D*Good Testing Quad* 1955-56*#3

Description: 4 x 12au7 RCA Tubes Made in USA for Conn Black Plates The lettering may be smudged/missing ***Price is for 4 tubes as pictured**** Tested on enhanced Triplet E3444 Laboratory Tester by Paul Hart of Roswell Ga. Results = See pictures for results Bogey(100%) = 2200/2200 micromhos @ 10.0/10.0 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, ___-8.5___Volts bias or Cathode resistance*What were your tubes tested at? I do combine S&H

Price: 58.99 USD

Location: Morganville, New Jersey

End Time: 2024-12-01T22:18:55.000Z

Shipping Cost: 8 USD

Product Images

4 x 12au7 RCA Tubes*Black Plates -D*Good Testing Quad* 1955-56*#34 x 12au7 RCA Tubes*Black Plates -D*Good Testing Quad* 1955-56*#34 x 12au7 RCA Tubes*Black Plates -D*Good Testing Quad* 1955-56*#34 x 12au7 RCA Tubes*Black Plates -D*Good Testing Quad* 1955-56*#3

Item Specifics

Restocking Fee: No

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: RCA

Model: 12au7

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