[TenTec] Running a Century 21 on external 12V power

[Josh Gibbs]

OK, I tried this trick and I found 3 'tropical fish' capacitors that buzzed
like a SOB when I touched the 'probe' to the positive lead. 2 on the audio
amp board, and one on the pre-amp board.

What should I replace them with? Did Ten-Tec use these because they possess
some special property, or were they just cheap back in the '70's? Can I
replace these with some mylar polyester film caps?

-Josh

On Fri, Jun 2, 2017 at 12:50 PM, Stuart Rohre <Rohre at arlut.utexas.edu>
wrote:

> There is an old radio troubleshooting trick:
>
> You use a insulated test probe, (length of solid wire set in an insulated
> handle to safely handle it).
>
> Move this to the plus end of each electrolytic cap, in turn, and see if
> the hum level jumps up.  Likely that cap may have dried out and changed to
> lesser value if you get more hum on one than others similar.
>