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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 16 Sep 2019, 10:16

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 Post subject: LM317 cathode bias
PostPosted: 22 Jul 2019, 14:28 
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Joined: 19 Oct 2018, 15:30
Posts: 132
Location: Montréal, Québec
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...


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 Post subject: Re: LM317 cathode bias
PostPosted: 22 Jul 2019, 16:41 
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Joined: 01 Jun 2013, 09:05
Posts: 804
I used it on my EL34 SE,

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

Its here:
viewtopic.php?f=9&t=5530&start=40

All the best
M. Gregg

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