Jean Hiraga's Super Class-A Amplifier
This design was modified from the original's Hiagra
to obtain an inverting input
and eliminate the internal function of the differential feedback
that works much better with the external resistive divider
This design was modified from the original's Hiagra
to obtain an inverting input
and eliminate the internal function of the differential feedback
that works much better with the external resistive divider
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You are right. I didn´t see that There are 2 voltage inverters (CE) and 2 followers (CC). This is a zero net inverting phase, so it is positive feedback.
I would say any few kind of preamp like such equipped with tubes and several vintage models from the 60s (e. g. first solid state generation).
Considering the advantages and disadvantages of a lower input resistance by power amps for new projects (approximately between 500 ohms and 5000 ohms), clearly outweigh the benefits.
Modern audio devices with high output impedance are very rarely on the marked.
Additional a refitting of an impedance matching section isn't a great issue.
Jean Hiraga's Super Class-A Amplifier
This design was modified from the original's Hiagra
to obtain an inverting input
and eliminate the internal function of the differential feedback
that works much better with the external resistive divider
Check also out the schema from post #4 about
http://www.diyaudio.com/forums/soli...ody-burmester-avm-schematics.html#post2598494
Same basic consideration regarded the input stage
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