In Reply to: Re: Aperiodic speakers posted by Crazy Dave on October 31, 2001 at 12:16:03:
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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Follow Ups
- Re: Aperiodic speakers - freddyi 10/31/0114:59:17 10/31/01 (5)
- Re: Aperiodic speakers - Thatch_Ear 23:26:31 11/1/01 (1)
- Re: Aperiodic speakers - Crazy Dave 13:12:03 11/2/01 (0)
- Re: Aperiodic speakers - Crazy Dave 08:04:48 11/1/01 (2)
- QB3, very similar to Davies' implementation - Wayne Parham 16:27:57 11/1/01 (1)
- Re: QB3, very similar to Davies' implementation - Crazy Dave 13:16:32 11/2/01 (0)