[R-390] Filter cap rebuild pics

Craig C. Heaton wd8kdg at worldnet.att.net
Sat Mar 19 18:34:02 EST 2005


Hello Cecil,

Just getting started on a Motorola R-390A, all of the sub-assemblies are on
the bench. This unit was working (somewhat) before I brought it home. So if
it never plays again, its my fault.

This will be my first attempt at restoring a receiver, done several
transmitters. Rebuilt a Johnson 500 this winter and now need a good set of
ears. The filter caps are original, circa 1956 and I want to restuff the
cans with new electrolytics. Cutting the old cans open and getting the black
goop and old caps out shouldn't be a problem. THE QUESTION, what new caps
will fit into the old cans??? If you have a part number I can order from
Newark, Mouser, etc.

I see two new orange drops, (C549&C553) and a new electrolytic, C609. About
the only other piece not present and accounted for is the line filter. Every
other piece is original.

Not looking for a museum receiver when I'm done. I just want a good working
receiver, that hopefully I don't have to work on for a couple of years.
Planning on changing out the paper caps, black beauties, clean the
tranny,(its dirty,some roller not turning)and realign.

Then its time to play HF radio, haven't had a yeahaaaaloooo AM angle music
station on the air since 1984.

Tnx,
   73's
      Craig






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