• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Submitted for your (dis) approval, OTL, Autobias Inv. Futterman

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#21
Yup--You're right, Not sure the actual O/P impedance of this version, but the design has moved on somewhat in recent times.

This version does have a loop/global feedback into cathode of first stage...

There's another thread here that contains the 'evolution' of this amp into what it currently is....

Here you go, This thread was started by someone else on a slightly different design and got sorta taken over....

http://www.diyaudio.com/forums/tubes-valves/189282-vacuum-tube-otl-power-amp.html
 
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#22
Howdy, I just found this rather old thread. Since I am in the process of building something similar I would like to ask how much current flows via the C+ 320 V supply. Would be great to know this because I have to somewhat estimate for designing the PSU.
 
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