[R-390] Filter cap temperature

[eldim at att.net]

Hello Barry & Crew,
MY thoughts on the R-390 Power Supply Filter Electrolytics located on the AF Deck are:
1. If you have a Octal Tube Socket Adapter, you can remove the suspect cap and insert the adapter in between to facilitate making measurement with your VOM, VTVM, or  for OScope observations.  It same the trouble of removing the deck.  I normallly take a AC Ripple Reading after making the Voltage Measurement.  A scope will give you a nice picture of the ripple.  I don't have the figures handy, but we all know that you want minimum AC Ripple on your DC buses. 
Good Luck.
73,
Glen Galati, KA7BOJ
Tacoma, WA

-------------- Original message from "John KA1XC" <tetrode at comcast.net>: -------------- 


> There's hot audio output tubes running right next to it. The 2 uF AGC cap in 
> the IF deck runs warm too for same reason, it's surrounded by tubes. 
> 
> If you want to be thorough then rebuild them, it's good messy fun. I found 
> an open crimp connection in the last pair I did. 
> 
> Congrats on fixing the B+ problem! 
> 
> John 
> 
> 
> 
> > While tinkering with the "new" R390A last night, I noticed that C603 is 
> > getting slightly warm. The other cap is cold. Is this possible an 
> > indication of low ESR? Do these old caps generally leak a bit or should I 
> > be concerned? I hadn't planned on replacing them as they seem to be 
> > working, but if they're going to blow, then I'd rather go ahead and 
> > replace/rebuild them. 
> > 
> > Thanks, 
> > 
> > Barry - N4BUQ 
> > 
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