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Re: Aperiodic speakers

Hi Dave -

Dyna's push-pull tube amps used David Hafler's form of tapped-screen feedback which created a hybrid plate curve characteristic between pentode and triode plus had 20dB of voltage loop negative feedback to the 1st 7199/6AN8 pentode gain stage - the UL slope looked something like triode yet allowed large swings - high z is problematic with pentodes as the loadline hits the "bunched-up" area.

the SE case is up against less primary inductance in the output transformer than push-pull as they're typically gapped to prevent full saturation of the core which may occur otherwise - my homemade parallel 2A3 SE amp has extra problems from an interstage xformer - it does Ok on all horn system

btw - are Wayne's Pi alignments pretty much like QB3? - I'm not used to his terminology!

Freddy


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