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Old 21st April 2009, 06:29 PM   #1
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Default SE cathode bias question

Generally speaking, does a higher plate current cause a harder/brighter sound? Does a lower plate current cause a warmer/rounder sound?

I have a SE amp I want to tweak but not sure which way is logical.

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Old 21st April 2009, 06:34 PM   #2
SY is offline SY  United States
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No and no. I think you'll have to experiment on your particular amp.
“Instead of Rational Law, objective truths perceptible to any who will undergo the necessary intellectual discipline, Knowledge will degenerate into a riot of subjective visions. . ." - Auden
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Old 21st April 2009, 07:53 PM   #3
rdf is offline rdf  Canada
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Originally posted by SY
No and no.
Within limits of the supporting components (OPT, etc.) and assuming the tube isn't being biased poorly, I've always found higher currents through triodes correspond with lower second harmonic at the expense of raising higher harmonic components. That generally matches the bright-harsh/warm-round description. Of course, this also ignores plate impedance, harmonic cancellation, feedback, etc..

I think you'll have to experiment on your particular amp.
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