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In Reply to: RE: Pre Amp Tube Matching Question posted by scriabin on April 14, 2014 at 07:18:22
you do not have to choose, those are the qualities that are matched by the seller.
AB.
Follow Ups:
small tubes are normally not used in push-pull applications. right? so critical matching makes not sense really. also right?
i assume you would not even notice if the emission of a left channel triode system differs 20 or 30% from the right one. just MY experiences...Nunki
The times, they are changing...
Edits: 04/14/14
PP amps do use small tubes in the input sections, but close matching is probably more critical in preamps and phono stages.
AB.
If a dual triode is used as a long-tailed pair phase splitter, matching is reasonably important, more for transconductance than noise or emission. Reason: A transconductance match will drive the output tubes differently (unless your amp has an AC balance control, in which case transconductance matching is not important). Emission matching isn't terribly important because the tube will be happy with any reasonable quiescent operating point. Noise isn't terribly important because at the phase splitter/driver you're dealing with the largest voltage signals before the output tubes, so the signal spends most of its time way above the tubes' noise floor.
Note that this discussion only applies to long-tailed pair splitter drivers.
Most that I've seen are single-ended, Class "A."
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