[sdiy] OT: HV supply

[John L Marshall]

I built a power supply with adjustable but not regulated plate voltage. I 
used a 6L6 in series as an adjustable resistor. The negative supply uses a 
gas tube (0 or O) as a shunt regulator.

Take care,
John
www.sound-photo.com
www.antenna-farm.com

----- Original Message ----- 
From: "Travis Shire" <tshire at charter.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, October 28, 2007 4:40 PM
Subject: Re: [sdiy] OT: HV supply


>> You can often find high voltage stuff at hamfests. Do you really need
>> the high voltage regulated? For tube circuits, although screen
>> voltages are frequently regulated with a gas discharge tube,  the
>> plate voltages are not often regulated. The hardest part about
>> building a supply like that is finding the transformer. After that
>> it's an afternoon's worth of soldering and two afternoon's worth of
>> metalwork.
>>
>>
> The ham swaps in my area are usually pretty small and I rarely see any
> interesting (to me) stuff. I don't need a supply that will run a pwr amp
> section, 50ma would be plenty.  The main thing I'm looking for is easily
> adjustable plate and neg grid bias outputs. Saves alot of time when
> designing around uncommon tube types and dialing in the right plate V for 
> a
> specific sound. I have a non regulated supply I built mainly for checking
> condition of HV electrolytics so that's single output only.
> I have a schemo for a couple of Heathkit supplies. They're not terribly
> complicated, but tracking down correct panel meters and a suitable 
> enclosure
> would be more hassle than its worth. And, I hate the metalwork part :-/
>
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