condition of your 539A?

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In Reply to: Strength of 45 Tubes....How weak is too weak?........ posted by Cut-Throat on December 15, 2014 at 08:27:22:

For example, do you have some known NOS type 45s that do test higher on the same tester? I know my 533A cannot elicit "normal" transconductance from some very current-demanding small signal triodes I own, in this case, 6900s. NOS 6900s test way low on my machine. Same is true to a lesser extent for medium mu/medium Gm tubes, like 6SN7. I just use NOS samples as "controls" when trying to evaluate used tubes.

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Follow Ups Full Thread

Topic - Strength of 45 Tubes....How weak is too weak?........ - Cut-Throat 08:27:22 12/15/14 (4)

condition of your 539A? - Lew 08:07:04 12/18/14 (1)

RE: condition of your 539A? - Cut-Throat 09:09:27 12/18/14 (0)

RE: Strength of 45 Tubes....How weak is too weak?........ - amnesiac 14:42:40 12/15/14 (0)

RE: Strength of 45 Tubes....How weak is too weak?........ - Caucasian Blackplate 11:03:03 12/15/14 (0)

Follow Ups

condition of your 539A? - Lew 08:07:04 12/18/14 (1)

RE: condition of your 539A? - Cut-Throat 09:09:27 12/18/14 (0)

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