Re: [Amps] Semtech?

[R.Measures <r@somis.org>]

On Oct 25, 2004, at 7:01 AM, Web Williams wrote:

> I think I might have some of these in my parts bin- pulls from a Henry
> amplifier. That was back in my "repair by parts substitution" days
> before I had any test gear, but it was too expensive to pay someone
> else to fix things. There's nothing wrong with them- and I think I paid
> about $35 apiece for the replacements. If you (or anyone on the list)
> is interested in them, let me know. It will take me a couple of days to
> locate them. I was never able to get any indication on them with my
> diode tester, and when the new ones arrive, I got no indication on
> them either! (!) (?) Out of curiosity, and in concurment with Steve,
> how do you test them???

FWD:  Apply c. 14vdc, in series with 20 - 500 ohms, with pos. to the 
anode-end.  V-drop should be approximately 7V for a 10KPIV unit.
REV:  Connect to high pot tester with neg. on anode-end.  Slowly 
increase inverse voltage until 2 uA flows.  This is the actual piv.

cheers, Web
> -Web Williams in Myrtle Beach, SC
>
> StephenTetorka@cs.com wrote:
>
> > Hi all:
> >
> > Got my 813 parts rig.
> > The PS has two " Semtech SA 7477 " rectifiers.
> > Black metal tube with pix of diode on it...top metal cap.
> >
> > Might anyone have data on it?
> >
> > How to check them?
> >
> > Should I use them ...or replace with something else?
> >
> > Tnx,
> > Steve
> > WA2TAK
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>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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