[Milsurplus] Capacitor Question

[Al Klase]

Guys,

This is an excellent troubleshooting methodology, to root out problem 
caps.  It's especially useful in cases, like ARC-5's, where its really 
inconvenient tp shotgun the capacitors.  Everybody needs a good bench 
supply.

Al

Marty Reynolds wrote:
> I'd add this tho.  Make sure no filament supply.  Apply more than design
> B+ to rx thru a current limited supply.  Like 400vdc w. seriesed 25K
> resistor.
>
> Measure drop across resistor & if zip, you & the purported micas are fine.
> If big drop, look @ ckt. for shunt across B+ line.  If found then lift it
> & try again.
>
> If drop still there, start rattling thru all B+ isolation resistors to
> ferret bad bypasses.
>
> I reported this months back as a fast way to revive a long-dead BC-455. 
> Found only one bad "in-can" bypass.
>
> Recent example is a BC-224 fm weeks back.  Old one, BC-224h by RCA - sn
> 98.  Must have been in a lean-to for years.  Lotsa outside mud.  But
> after lifting RF gain ctl fm gnd, NO drop across current limiter R!!!
>
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>   
-- 
Al Klase - N3FRQ
Flemington, NJ
http://www.skywaves.ar88.net/


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