Tube DIY Asylum

Ralph, is phase going to be a problem?

73.201.131.109

garymuffley

In Reply to: RE: The problem is posted by Ralph on January 07, 2025 at 10:03:35

If feedback is returned to the cathode, and feedback is instead applied to the control grid, is there a problem because the grid is not in phase with the cathode?

Follow Ups:

Yes. - Ralph 12:14:08 01/10/25 (1)
In order for this to work the phase has to be opposite. In a PP amp this isn't a problem; you can change it out the power tubes or the drive to the power tubes.
- RE: Yes. - Triode_Kingdom 15:34:05 01/11/25 (0)
  "In order for this to work the phase has to be opposite. In a PP amp this isn't a problem; you can change it out the power tubes or the drive to the power tubes."
  
  This also works out correctly in a line stage with a cathode follower output. It's a mystery why designers haven't exploited this technique to a greater extent.

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