[ARC5] Circuit Help Needed

[Rich Post]

Check out the Neustadt patent for that circuit.  Here's the schematic link.
It's almost identical.

<https://patentimages.storage.googleapis.com/pages/US2443541-1.png>

>From 700 to 250 is a major drop.  The parallel 6Y6 pass tubes have to eat
the remainder at that output current.   That's a lot like the linear
supplies such as Astron where the pass transistors heat up the difference.
A good regulated power supply limits the load on the pass elements by
arranging for the loaded dynamic voltage input to be closer to the output
voltage.at maximum current.  My big Kepco variable regulated supply
actually uses a Variac in tandem with the variable electronic control to
keep the pass tubes happy by limiting that voltage difference.  Here's some
info on the Kepco.
<http://boatanchorpix.x10host.com/Kepco605.htm>

Rich KB8TAD

On Fri, Feb 10, 2017 at 7:36 PM, Mark K3MSB <mark.k3msb at gmail.com> wrote:

> Good Evening All
>
>
>
> I picked up a nice home brew power supply that has a few items that are
> stumping me.    The photo of the circuit in question is
>
>
>
> http://www.k3msb.com/temp/img005.jpg
>
>
>
> It’s 700V unregulated in and 250V regulated out.     I haven’t been able
> to figure out what the 6SL7 or OB3 regulator are doing in this circuit.
>  I’ve triple checked my schematic (which I obviously had to hand draw
> from staring at the innards of the power supply).
>
>
> The circuit does indeed work.
>
>
>
> 73 Mark K3MSB
>
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