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In Reply to: A possible selective feedback for circlotron posted by 6AS7_6SN7 on October 12, 2010 at 01:49:57:
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
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Follow Ups
- RE: A possible selective feedback for circlotron - Banat 09:03:49 10/12/10 (1)
- I know there is always room for improvement... - 6AS7_6SN7 09:38:21 10/12/10 (0)
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