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In Reply to: RE: tube measurement posted by dgaapc7 on September 05, 2020 at 08:47:57
Likely plate current. Are there any letters prior to, or following the numbers? Like "lp"?
If so, you have a very tight matched set. Ratings within "1" are excellent.
Plate current can differ in manufactured tubes, but will still be in spec for general use. For optimum results and amp biasing, it is best to further sort (or match) tubes into groups closest in spec to each other.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Follow Ups:
Be careful - that plate current reading was at one value -
Well matched tubes are matched using measurements from multiple operating points -
Unless they are being matched by the MFGr for that amp ONLY-
Happy Listening
Yes, sadly that is the case for most readings given, unless performed as you say.
Heaven only knows how the half dozen or so quads of Winged C's I purchased over the years were actually tested for matching.
Fortunately I've never heard of any serious issues due to a lack of comprehensive testing.
I have seen some sellers warn of extremely high lp. Which is good to know. Especially if you have an auto-biasing amp.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Thanks for the help.
LowIQ
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