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In Reply to: RE: Why would the input tube appear to be more linear posted by Triode_Kingdom on February 6, 2023 at 20:35:51:
wrote about this 60 years ago. You might want to read his comments on this, buried somewhere I can't recall, but probably the tome is on Pete Millet's website, link below.
Now Crowhurst did not say that mixing the feedback ahead of the circuit would improve things; what he said is that non-linearities at the feedback node contribute to harmonic, inharmonic and IM distortion which becomes a sort of noise floor of any amp using feedback in this manner.
So this is more a logic thing; if you linearize the feedback node you'll get less of these effects.
We can see this in opamps, where there are lots of transistors involved; the feedback is mixed ahead of the opamp itself. Opamps can be quite linear and very neutral; we hear them all the time in any modern recording. Of course they are often using quite a lot more feedback than most tube amps.
We've been using this technique of feedback in our amps for decades.
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Follow Ups
- Norman Crowhurst - Ralph 12:31:41 02/07/23 (6)
- RE: Norman Crowhurst - Triode_Kingdom 22:51:48 02/07/23 (5)
- You should try it - Ralph 10:11:58 02/08/23 (4)
- RE: You should try it - Triode_Kingdom 16:20:18 02/08/23 (3)
- In a conventional tradition tube amp this would be easy to do. - Ralph 09:46:10 02/09/23 (2)
- RE: In a conventional tradition tube amp this would be easy to do. - Triode_Kingdom 12:36:03 02/09/23 (1)
- :) +1 nt - Ralph 13:47:13 02/09/23 (0)
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