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In Reply to: RE: Some clarification posted by morricab on February 11, 2025 at 03:45:17:
With push pull, there would be no need for Class AB because there would be no notch distortion in Class B.
I just thought of an analogy. It maybe not a good one but here goes.Class AB is a "fix" for Class B much like a suppressor grid in a pentode is a fix for the tetrode.
When they added the screen grid to a triode to block internal feedback path between the plate and the screen that lowered the gain and reduced the distortion, they created the problem of secondary emissions and had to add the suppressor grid to fix it.
When they went from Class A (push pull) to Class B (push pull), the non-linear behavior of amplifying devices in the cutoff region created cross over distortion and they had to put some of the idle current back to "fix" it.
A pentode is a fix for a tetrode but that doesn't make it a triode.
A triode is it's own thing.Class AB is a "fix" for Class B but that doesn't make it Class A.
Class A is it's own thing.I warned you that the analogy might not be very good. :-)
Tre'
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Follow Ups
- RE: Some clarification - Tre' 02/11/2507:37:47 02/11/25 (2)
- Hmm, best sounding class B is McIntosh; unity coupled circuit IS brilliant, however-nT - Cleantimestream 07:47:47 02/11/25 (1)
- Vintage Mac unity coupled consumer tube amps - Steve O 09:17:08 02/12/25 (0)
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