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In Reply to: RE: preamp vs power amp tube distortion posted by ph5y on August 11, 2014 at 08:05:32
It really depends on the topology of each circuit.
If you are asking about whether the harmonic profile differs when overdriving a preamp/driver tube in a power amp vs. the output tubes themselves, then this is most likely true. (For the typical pentode/tetrode wired in UL driven by triodes)
The effect can be exacerbated when driver tubes push output tubes hard enough to draw some grid current.
Follow Ups:
How would you characterize the difference in sound between preamp and poweramp distortion or is it too variable to characterize?
Thanks again,
PH
It's never too late to turn back the clock.
It's very difficult to generalize. It depends a lot on whether a given tube is wired as a triode, pentode, or U-L wired. The feedback structure will have an influence on the distortion, and even the speaker hooked up to a given amplifier can influence the distortion spectra if a global loop is used and fed from the speaker tap.
If you are talking tube guitar amps, pretty big difference. Noticeable in those amps with GAIN and MASTER (or main volume) control.
I like a balance of gain stage and output stage OD. Or amps that have a single volume control. So, I need to have small SE amps to practice in the house, to avoid domestic violence and police involvement.
8^)
nt
It's never too late to turn back the clock.
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