[Collins] Re: 75S-1

[jbrannig at optonline.net]

Antique Radio Supply has new replacement multisection capacitors that will fit the 75S receivers.
There is little room in the power supply section of the chassis for three new electrolytics, so the $30+ price from Antique Radio is worthwhile.
I have cleaned out old capacitor cans and added new electrolytics.  It is not too hard to do, but the can in the 75S is narrow and getting three electrolytics in there would be very difficult if not impossible.

While you are under the chassis, you might as well replace all the electrolytics.  Mouser has a good selection.
Jim
> It has a little AC hum in the speaker.  It's not bad but
> I can hear it if the room is quiet.  The hum does not get
> louder when I turn up the AF gain.  
> 
> Does this mean that C59 the HV capacitor, is getting soft?  It
> shows as a multi section cap on the schematic, the aluminum can
> that's sticking up between the audio transformer and the power
> transformer.  
> 
> I've never tried to hog out and refill an aluminum capacitor.
> 
> I don't know if I can find 3 40 uF caps that'll fit in there. I
> hate to just add 3 caps to the bottom of the radio and bypass
> the cap. 
> 
> What are good caps for this application?