[ARC5] BC-348 Resistors

[Tim]

Back when I was replacing those bad caps in mil equipment they were known
as TDBPC's (Those Damn Black Plastic Capacitors), yup they were/are a
problem.
BTW I did add a very small amperage fuse in the BC-348R B+ line as
protection against a shorted or leaky bypass/coupling cap.  Cheap
insurance, but I forget the value, been a long time since I've been in
there...
Tim
N6CC

On Wed, Mar 27, 2024 at 1:27 PM Richard Knoppow <1oldlens1 at ix.netcom.com>
wrote:

>    These were paper caps in postage stamp packages like mica caps. I
> can't find any technical data but they seem to have been used in place
> of mica caps during WW-2 when mica was in short supply. I was warned
> about them by my mentor when I was a kid. All I have ever found were
> leaky. I think Solar made similar caps. Both Micamold and Solar made
> other types of caps. The Micamold caps I've dissected have no obvious
> mechanical faults but seem to have stopped being capacitors at some
> point. The package is similar to a larger mica cap. There is a dot code
> on them, cant remember but it marks paper or mica with a color dot.
>     Curiously, both Micamold and Solar dissapeared at around the same
> time, around 1947. Have never found out what happened to them.
>
> On 3/27/2024 12:24 PM, hwhall--- via ARC5 wrote:
> > But Micamold did make real mica capacitors, so the name alone isn't a
> > red flag for replacement. Most of us know that but I bring it up for the
> > benefit of possibly new restorers reading the thread.
> >
> > Wayne
> > WB4OGM
> >
> > On Wednesday, March 27, 2024 at 01:21:16 PM MDT, Ken
> > <kgordon2006 at frontier.com> wrote:
> >
> >
> > I recently rebuilt an NC-57 for a kid.
> >
> > Every single micamold cap in that radio were so leaky they were more
> > like bad resistors than capacitors.
> >
> > I literally hate those things.
> >
> >   They certainly are not mica-anything: they are squashed poorly-made
> > paper caps.
> >
> > Ken W7EKB
> >
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> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> SKCC 19998
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