250W Hybrid Amp

[GECO]

I will let the cat out of the bag of my latest build. a 250W hybrid amp. the idea was to have simplicity in the circuit but to real make it sound very good the supporting power supplies must be the best that one can get.

so here it is.
zero negative feedback (i can hear the coughs and mutterings - blah blah blah - get over it)
2 x 500va C-core transformers with about 70v on the rails
18000uf/rail CRCRC extremely low ESR power supply (72 caps in total)
valve side i am using a Pass supply with a buffer, extremely low noise and low output impedance
SRPP+ for the VAS - 6922
total gain 26db (see i can't loose anything with a feedback loop) otherwise i have to add another gain stage
damping factor is around 8

is this a original design? well what is these days. there is nothing new. this one is a is a combination of commonly used topologies but you wont find one exactly the same.
and i haven't taken a VA apart to copy

again I have to give credit to Alan Hobkirk that helped me with some aspects of this design

Amplifier board x 2

output stage power supply x 2

valve stage and power supply x 1

 

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