Hi Bob,
The ol' MPS-U10 was originally a Motorola part, obsoleted almost 20 years ago.
Suitable available substitutes would include:
The MJE340, 2N5656, and 2N5657
Made by On Semiconductor the successor to that part of the Motorola discrete
line.
Incidently, the screen regulator circuit that I employ with my 4CX1500B is
posted on my webpage at:
http://wc6w.50webs.com/wc6wamps/index.html?fr65.html
73 & Good morning,
Marv WC6W
http://wc6w.50webs.com/
--- On Sun, 6/29/08, Bob Maser <bmaser@tampabay.rr.com> wrote:
> From: Bob Maser <bmaser@tampabay.rr.com>
> Subject: [Amps] Screen Power Supply.
> To: "AMPS" <amps@contesting.com>
> Date: Sunday, June 29, 2008, 6:39 PM
> I've always felt that copying a proven design is more
> expedient that
> reinventing the proverbial wheel so when I came across
> George Daughters K6GT
> design for the 4CX1600 amp in the 2000 ARRL handbook, I
> decided to copy some
> of the circuits he outlined. The power supply looked good
> to me so I
> started looking up the component parts in my trusty Mouser
> catalog. When I
> got to the screen supply section, I came across a NPN
> transistor designated
> as Q1 MPSU010. I cannot find this part listed anywhere. I
> believe that it
> is manufactured by Central Semiconductor Corp because I
> see other MPSxxx
> parts made by them but I can't find it on their
> website. Can someone lead
> me to a source for this part and a description? I am going
> to take a 300VAC
> Peter Dahl transformer that I found a Dayton a few years
> back and full wave
> bridge it up to 420VDC and then I want to
> "regulate" it down to about 350VDC
> with some series Zeners. I am not using the 4CX1600 but
> that tube seems to
> have a lot in common with the 4CX1500B, the tube I'm
> going to use.
>
> Any help on this?
>
> Thanks,
> Bob Maser W6TR
>
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