[ARC5] Circuit Help Needed

[Kenneth G. Gordon]

On 11 Feb 2017 at 1:29, J Mcvey via ARC5 wrote:

> looks like it's a stable reference voltage for the feedback amp.

Yes. That is exactly what the 0B3 is. The 6SL7 is the control tube.

> That's a whole lotta stuff to get 250 volts!
> Is that good for 300 ma regulated or something like that?
> You could probably get by with one big nasty tube instead of 3 .

Like a 6SA7, which was designed for that service.

That is a standard electronically regulated power supply, first desiged sometime in the early 
1930s and published in many handbooks ever since. There are solid-state versions of the 
circuit in common use. Astrons, for one.

You use more "pass tubes" in parallel to increase the output current capability.

I have an HP variable regulated high voltage bench supply which uses 8 ea 6L6s, and 
several Heathkit versions which use a pair of 6L6s as pass tubes.

They work very well.

I think what Mark has is a home-brew version of that circuit. It should work very well as long 
as the components are up to snuff.

Ken W7EKB

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