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RE: A possible selective feedback for circlotron

Posted by Banat on October 12, 2010 at 09:03:49:
Hi Lucca

Basicly agree with Your posted schematic,results and conclusion,but I think next:
Is better to have Only for Anode Follower driver stage separate supply direct from oposite output(Circlotron)power stage two B+ supply.
This way of`bootstraping` between driver stage, AC coupled to grids of output power stage, achive some low value of positive feedback for anode of driver stage and results in bigger voltage sfing and overall lower distortion.
Of course ewerything else including GNFB remain the same like You posted in Your schematic

This solution for driver stage is actually esential idea of Mr Tapio Koykka,inventor of Counter Parallel Push Pull(CSPP) Amplifier(Circlotron),and this solution is succesfully used in many Circlotron Amplifier,VOIMA,Philips,Electro Voice...

Best Regard