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I have some Welborne Starchief 45 amps that I have been running for close to 10 years now. I have had some RCA Globe UX-245 Tubes in them for about 5 years. I decided to test them and they tested about 700-800 mhos on my Hickok 539A Tester. The Spec that is listed says they should be 1170 for good.
I have heard that a SET amp does not push these tubes to hard, so they may work well even at lower test numbers.
My question is when do you replace them? I've got plenty in stock in my Tube Stash and the stronger ones don't sound any better than the weak ones. Is it fine to just 'Let them Fail' or should I replace them sooner. IOW - How weak is Too Weak?Cut-Throat
Follow Ups:
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.
The 539A has recently been Calibrated. I have plenty of Old Stock 45 Tubes that test very Strong. As New. My new Production 45s are similar testing as the Old Stock ones.
Cut-Throat
Its time to pull them and sell them on ebay as test like new!
Try a better testing set of tubes and listen for differences. Weak tubes will sound bad!
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