[ARC5] Circuit Help Needed

[Phillip Carpenter]

Heathkit made a similar power supply (EUW-15) that varied from 200-350vdc at 0-100mA. It used only three tubes: 6L6 series regulator; 6BH6 control amplifier; and 0B2 voltage regulator.

Phillip W4RTX 

Sent from my iPhone

> On Feb 10, 2017, at 9:00 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> 
>> 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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