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In Reply to: RE: Matched Tubes, What does it Actually Mean posted by BIOMAN on July 16, 2020 at 14:56:23
A reliable dealer labels the cardboard box with the measured values for gm and cathode current. Also, experienced dealers test the tubes under conditions resembling those found in working amps.
Factory matching by the current tube builders is, to be charitable, suspect. Competent dealers know which amps "like" tubes that bias either "hot" or "cold". A specific set of tubes may be well matched, but a poor choice for a given amp.
BTW, my go to guy, AA sponsor Jim McShane, is a big 3 Stooges fan. ;>)
Eli D.
Follow Ups:
Good info. I understand the concept of using the manufacture of the amp for the best matching, but my understanding is that they won't sell me tubes, and shipping round trip would be $800 and a three-month wait as they are starting back up from the COVID.
I may check out Amplified Parts as they use the Apex system which seems to be well thought out and provides plate current and transconductance.
You misunderstand me. Amp manufacturers overcharge for replacement tubes. :> ( Guys, like McShane, who truly know their business are who you go to for replacement tubes. Competent dealers know what works with specific amps and act accordingly.
Eli D.
"Amp manufacturers overcharge for replacement tubes."
Not all overcharge. I've found Manley's tube prices pretty reasonable. And Jim McShane does terrific work.
WW
"They were running on fumes, dazed and confused, in a high-powered automobile."
Does McShane's business have a name?
Yes, he does. He sponsors this board.
Link to Mr. McShane appears below.
Thanks, I will take a look
I'm working with him on putting an order together, and he's taking the time to look over a phono circuit for me and has made a few suggestions.
Jim goes above and beyond.
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