[Amps] Screen Power Supply.

[Radio WC6W]

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 at tampabay.rr.com> wrote:

> From: Bob Maser <bmaser at tampabay.rr.com>
> Subject: [Amps] Screen Power Supply.
> To: "AMPS" <amps at 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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