6922 sepp with Balanced Gains

[Stee]

Der Treffpunkt für Elektronik, Mikrocontroller, Röhre, Forum, Platinen, Schaltungen, Onlineshop

here you can find a version of Aikido
in my picture a modification
where cathode have anode gain and viceversa

 

[Stee]

6SN7 SRPP AND SEPP

probably to have exactly the same gain between two rails @ zero NFB
need a SRPP before

 

[Stee]

dual supply

to solve the problem of GND
also good for headphone OTL stage

 

[DF96]

In post #2 that is not an SRPP, but an active load. SRPP takes output from the upper cathode, not the lower anode.

The result is not a verson of Aikido, because you have lost the main point of Aikido - that the signal currents balance at the HT supply.

 

[Stee]

yes true

but where is the news?
using three identical devices
with the same bias
you get the same gain
on both branches without feedback