[Milsurplus] Micamold disguised paper caps

[Marty Reynolds]

> Brad and The Group,
>
> OK, I'll weigh in on this one: REPLACE all the damn MICAMOLD paper caps
> (e.g., the rectangular .01 uF's) BEFORE you even turn the radio on.
> Don't waste time testing them or fretting over the situation. If they're
> not already leaky, THEY'RE GOING TO BE! (Perhaps only a few minutes
> after power is applied. If you want to keep the radio original for
> posterity, don't play it.
>

I've done several '348s & 312s/342s for friends.  Put 5ma current-limit
400v* onB+ ckt AND avc with filaments off.  Then went thru with dvm 
checkin voltage drop across isolation resistors, etc.  This is a fast-find
for the
ringers.  Usually 3 or 4 per set

Then left it on test for a day, blah - blah.  Have never checked R
tolerance

Now I did do one where micamold cases opened.  Owner blanched  @ idea
of a x-ray vision reviewer spotting callous clip-outs.

So this is worth a mention.  Take clipped-out case & put it in a vise
wide side up.  One vise jaw meets body thru a triangular file.  Crank
in pressure, voila.  Two neat halves  (walnut cracker was 1st failed
try).  Seem to remember put 2 .005s in to fit cavity

If u just do the clip-outs, revival can go in < 1hr.

  Marty

*simple bench supply w. 10-20k wire wound in series

 this also reforms electrolytics in some sets.  More on this
 if wanted