[ARC5] Circuit Help Needed

[Rich Post]

OK, my tired eyes thought they saw 6Y6 tubes on the hand-drawn schematic
which is what my little Lambda regulated supplies use.   Here's a Lambda 25
powering a Gonset Commander.
<http://boatanchorpix.x10host.com/Comndr.htm>

Will check out the RDH schematic.  Thanks for the reference.

Rich KB8TAD

On Sat, Feb 11, 2017 at 1:58 AM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> On 11 Feb 2017 at 1:41, Rich Post wrote:
>
> > 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 >
>
> Wel, not quite: Mark's circuit uses the 6SL7 connected in cascode with
> grid of one triode
> being connected to the plate of the other. The circuit I found in the
> Radiotron Designers
> Handbook follows Marks very closely. The only real difference is that the
> RDH uses a 6AS7
> pass tube.
>
> >
> > From 700 to 250 is a major drop.
>
> Yes. NOT good in my opinion. The input voltage for 250 V regulated output
> should probably
> be not more than 350 V at most.
>
> >  The parallel 6Y6 pass tubes have to eat the remainder at that
> > output current.
>
> Yes. However, if I am reading his schematic correctly, his pass tubes are
> 6V6s, not 6Y6s.
>
> >   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>
>
> Very interesting, Rich. Neat supply and even better job you did on it. :-)
>
> Ken
>
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