• 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.

"Junkbox" 2A5 SE

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coldcathode

coldcathode

Member
Joined 2009
Thanks Tubelab,

That was kind of my intention. I think I would try the Local Feedback from Plate to Plate.

You say about 330K as a starting point? How would I go about calculating what that value represents.

I guess what I mean is from the plate of the 1625 to the Plate of the 6SL7 at idle there is a voltage potential difference of 180Volts.

This obviously changes as the current changes thru the two tubes. What numbers am I using to calculate? Am I feeding back voltage?

Do I need to calculate in Rp somehow?
 
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