IMO NOS ARE POT, and LIE.
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I purchase previously owned tubes myself, and while I gravitate toward "NOS lightly used" tubes that are on the expensive side, I look for very strong test results for the tubes offered and like new physical condition. One can't help wondering, and I missing something? Should I have bought new-in-the-box NOS tubes? LOL
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RE: High testing POT tubes.
The absolute readings vary from tester to tester.
I look for tight matching and balancing, more than the absolute readings.
It works because the sections rarely wear evenly.
Even more important:
Whenever I buy a large lot, I take the worst and most poorly matched and balanced pair, break them in and listen to them. I have yet to find an audible difference between the closest and furthest testing pairs.
My gut tells me, what we are testing for has a very small relationship to what we actually hear.
I strongly warn against doing any critical listening on pot, you probably won't be happy, when you re-assess your purchase straight.
I strongly warn against doing any critical listening on pot, you probably won't be happy, when you re-assess your purchase straight.Definitely agree, even a jam box can sound great when one's attitude has been adjusted.
Ws_trader, curious as to what tube tester you are using, emissions or mutual conductance?
I can not tell how closely tubes are matched by listening to them either. I'm just guessing but it would seem that as long as they're not approaching "Bad" readings they would be able to produce the appropriate amount of electrons.
It also seems that spending a lot of $ to get a closely matched pair might be a mistake because triodes seem to lose strength at different rates, so they won't stay closely matched for long.
I have read a post from Jim McShane that said that the important match is materials and production, meaning tubes that were made at the same place at the same time.
Anyone who knows for sure what the truth about tube matching is want to chime in?
THE SECOND BIGGEST LIE?
"Tests like NOS".
Since vacuum tube manufacturers never published a booklet, of how their new tubes should read / test, on a vacuum tube test meter, and since vacuum tube meters read out, using different scales (in many cases, even by the same company);
How do they know, what a particular, tube type, brand, factory, and year, is supposed to test like, when new?
If the answer lies within the spiritual realm, I plead total ignorance.
Keep on rolling...