DIY Audio Projects Forum

LM317 cathode bias
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Author:  Gab [ 22 Jul 2019, 14:28 ]
Post subject:  LM317 cathode bias

Do you guys have experimented with a LM317 used as a constant current "sink" to bias an output stage ? I have seen this used in the RH amplifiers Image

I was wondering what are the advantages of regulating the current through the valve instead of using the regular resistor ?

These regulators have a maximum voltage, wich might limit the possibilities, or force the use of an NPN to raise its volage rating...

Author:  M. Gregg [ 22 Jul 2019, 16:41 ]
Post subject:  Re: LM317 cathode bias

I used it on my EL34 SE,

But combined it with cathode feedback and a few other things.

Its here:

All the best
M. Gregg

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