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RE: zeners

Posted by drsx (A) on October 12, 2016 at 21:51:45

In Reply to: zeners posted by DAK on October 12, 2016 at 17:46:59:

I have used both Zeners and glow tubes for the screens on both single ended and differential amps. It works well. It is not a perfect regulator, but it does not need to be. It only needs to be better than the ~18K series resistor you would use from B+ to drop 50V at 2.7mA.

And indeed, you'll probably want a ~100R screen grid stopper anyway which adds 100R of series resistance, reiterating that a few ohms of impedance in the shunt reg is not terrible.

That said, if I were building an amp to be as good as it can be, then the simple Zener shunt is probably inadequate. In that case, I'd include a pass transistor and feed it from a CCS.

I'll add that the zener noise has never really been a problem in this use, but a cap bypass will eliminate it.

Also, I like the series resistor for use on guitar amps for the added distortion.

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