[AMRadio] High Voltage Power Supplies


bcarling at cfl.rr.com bcarling at cfl.rr.com
Sun Oct 30 13:39:04 EST 2005


Noit sure Don - a fellow ham traded these to me.
They are black disks and look pretty much like a large 
ceramic capacitor, if you can imagine...

They are marked:
STM  and  CL-30

I think the resistance at rest is about 3 to 5 ohms.

On 30 Oct 2005 at 9:24, Rev. Don Sanders wrote:

> OK Bry, You got my interest. What is the part number and are they from
> Mouser? I know I need several for my boatanchors and my 2 Astrons(20 and 35
> amp).
> 
> Healthfully yours,
>                           DON W4BWS
> ----- Original Message ----- 
> From: <bcarling at cfl.rr.com>
> To: "Discussion of AM Radio" <amradio at mailman.qth.net>
> Sent: Sunday, October 30, 2005 7:27 AM
> Subject: Re: [AMRadio] High Voltage Power Supplies
> 
> 
> > On 30 Oct 2005 at 9:08, Ed Swynar wrote:
> >
> > > Is this the reult of transients / voltage spikes somehow "overwhelming"
> > > the diodes...?
> >
> > Probably - why not try one of those transient suppressors (varistor I
> think)
> > on the primary side of your power tranny?
> > I just put one in my Astron 35M and it eliminated the "THUNK!"
> > at power-on.
> >
> > A number of guys have put them into Johnson xmtrs with similar
> improvement.
> > Maybe it could save your diode strings.
> >
> > Do you have a capacitor-input filter on the p.s.u.?
> > Choke input filters tend to be a bit kinder to the rectifiers.
> >
> > 73 de AF4K, Bry
> >
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> 
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