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RE: feedback applied to grid

Yes, Leak used the Baxandall tone circuit in the output stage. The phono EQ likewise uses feedback from plate to grid. The EF86 is one of my favorite small-signal tubes, and I'm not surprised this unit performs well.

I uncovered two online references with schematics detailing the use of the two control grids of the 6BE6 for audio. Both sources are from the early 1950s, and they show the tube being used as a mixer. Perhaps the question now becomes whether feedback applied to a separate grid with different distortion characteristics is a valid means of avoiding cathode node distortion. I might test this with the choke-loaded follower I'm fond of when my current project is complete.







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