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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: Unbalanced double triode creates unbalanced speaker output? posted by Jim McShane on September 6, 2003 at 08:07:47:
"The long-talied pair (due to the "tail" resistor) tends to be self-balancing also"If it was operated with a theoretical constant current source in the cathode, and if the Miller effects were insignificant, then yes- otherwise , the 2 sides end up with unequal gain, hence the balancing schemes usually employed vary the plate resistor of one side to balance them, or use fixed calculated resistors (82k & 100k) as a cure all like in the Fender and amps.
This assumes of course that the tube in question has equal gain and transconductance for both halves, which is what Steve's point was- that in his example, since the circuit is fixed with no adjustment like a Citation or VTL has, one would be advised to use a tube with equal halves to ensure balance if that's what one seeks.
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- Re: Unbalanced double triode creates unbalanced speaker output? - Story 21:58:39 09/06/03 (0)
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