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Re: Don't think so

"I have subjectively been calling plate resistance feedback on a triode as a "pure" form of linear feedback, immune to the problems of loop feedback."

IOW, plate-resistance feedback (PRF) does not produce multiplicative artifacts, is that your thesis, Kurt? It *apparently* does not, because H2 only is found in the residuum of many triodes. Is it safe to assume that this type of feedback does not multiply the orders? Or should we assume that the multiplicative products are there but are reduced by the PRF?

According to Ketchledge local feedback *does* multiply the orders (he gives a formal argument in BSTJ, Nov 1955). And according to Baxandall feedback above a certain threshold will begin to reduce high-order harmonics (the feedback first produces, then reduces, high-order products as the feedback factor is increased from zero). This threshold is set not only by feedback factor but also by inherent linearity (neglecting DIMD's). If the triode is inherently linear then PRF might make it moreso, is what I'm saying.


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