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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
Don't forget about some of the eBay sellers who claim a matched pair of tubes are two that look alike. Yes this is meant to be light hearted but sadly true.
Contact McShane he is a great guy and will do a fine job for you.
Cal
Follow Ups:
i am afraid, matched in tube business means nothing but just one single plot-point on the tube´s graph and not completely compared an combined by indentic graphes.
so matched pairs, quads etc. mostly are every thing else than correctly "matched" and means marketing only. am i right?N.
Just smile - it confuses other people.
Edits: 07/19/20
Maybe that's what it means to you?
I spend a huge amount of time sorting out NOS stuff (yes the spread can be enormous).
To give you some idea, out of a box of 15 s/h 807s I got maybe 2/3 pairs.
Idem when I weeded my way through 25 NOS 5B254M (STC 807).
From the 25, 3 were DOA, making an internal arc/flash when started up.
Several were weak, several were uber-strong.
In the end I got 2 quads and a few pairs out of it, with the duds just going for decoration.
From my large boxes of 250+ NOS pentodes I get a spread of between 9m/a (well under spec) under true working conditions to 22m/a (well over spec).
As they degas, within a few minutes they stabilise, so you have to let them get warm.
In my dual QUAD pentode amp I match all 8 to within 6%.
It takes a lot of patience, because they do drift a little.
How do I do it?
I fit them in a fully working amplifier and check them one by one, inc a full power test to see if there is any change in SQ wave response or THD/IMD.
a smart technician told me, he matches power tubes in the amp they are destined for. so do i now - and that works great!
Just smile - it confuses other people.
Edits: 10/13/20
i am afraid, matched in tube business means nothing but just one single plot-point on the tube´s graph and not completely compared an combined by indentic graphes.
so matched pairs, quads etc. mostly are every thing else than correctly "matched" and means marketing only. am i right?
N.
Just smile - it confuses other people.
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