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In Reply to: Some don't require *correction* for low distortion results -nt posted by E-Stat on June 6, 2022 at 12:37:04:
FETs & tubes have square-law transconductance, BJTs are exponential - none are linear. In general, if you arrange things to allow the signal current excursion to be along only a small part of the transconductance curve that might be linear enough (i.e. very strong class A biasing). Or, add some degeneration (local feedback) - that will straighten things out.
Whenever audio designers say 'no feedback' they mean no global feedback around multiple gain stages. Any designer who eschews local degeneration for audiophile sensibilities is not really a designer! Except in the case of tubes - if you degenerated the circuit you would not be able to hear the differences in non-linearity between tube types so clearly. That is a win-win, poor circuit design* gets passed-off as voicing/tuneability and everyone is happy:)
*I am joking about poor design. If it is what customers want then it is the right thing to do.
Edits: 06/06/22
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Follow Ups
- See previous answer - 13th Duke of Wymbourne 18:53:56 06/06/22 (10)
- RE: See previous answer - morricab 02:01:19 06/10/22 (0)
- We should all read Bruno Putzeys' "The F-word" - Feanor 04:32:21 06/07/22 (6)
- RE: We should all read Bruno Putzeys' "The F-word" - 13th Duke of Wymbourne 14:07:01 06/07/22 (5)
- I'm drawn to Putzeys' conclusions at the end "The F-word" - Feanor 04:34:33 06/09/22 (3)
- RE: I'm drawn to Putzeys' conclusions at the end "The F-word" - morricab 01:56:56 06/10/22 (2)
- We're entitled to our sound preferences - Feanor 04:23:09 06/10/22 (1)
- RE: We're entitled to our sound preferences - morricab 01:21:03 07/18/22 (0)
- Accu Jack - AbeCollins 16:06:04 06/08/22 (0)
- In the end... - E-Stat 19:12:06 06/06/22 (1)
- +1 - 13th Duke of Wymbourne 13:21:50 06/07/22 (0)
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