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118X electrical overhaul - Printable Version

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RE: 118X electrical overhaul - Mondial - 01-02-2017

As long as the IF transformer coils are not open or shorted, don't worry about the wax. I have a 118 and my IF's look the same as yours.

That additional electrolytic was added by a repairman and is not original or on the schematic. It was probably installed to reduce hum because the original filter caps were failing. 

I used a larger value replacement electrolytic after the choke, 22 uF (73)  to reduce background hum somewhat. Don't use more than 10 uf for cap (74) or you will increase the B+ voltage above spec. This cap should have a high ripple current rating as it is a bit stressed. I used a 10 uf 630v Polypropylene film in my radio to avoid problems.

RE: 118X electrical overhaul - morzh - 01-02-2017

RF coils dripping wax is common thing I see, not necessarily something to fret about. Could be just warm enough under there that some wax ran.
Coils, if not open, same as mica caps, innocent till proven guilty.

RE: 118X electrical overhaul - Davros - 07-17-2017

So this project hasn't died out yet, and I'm in the middle of recapping the unit. (life has been busy!)

In regards to replacing a Multi-Can Capacitor...

If there are 2 or more leads on a single terminal, say 3 leads going to a 1uF terminal, can you split up the leads and give them each there own 1uF capacitor? One of the current leads comes all the way across the chassis, and I have a good place to put an individual 1uF cap.

I can't see this causing any harm, and I would think they did this just to lower the parts count.

Thanks!

RE: 118X electrical overhaul - morzh - 07-17-2017

There might be the need for all three to be together and then de-copuled with 1uF cap, so, likely no, if there were three leads on the same cap, I would keep it this way.