Capacitors - In or Out?

Glen Zook gzook at YAHOO.COM
Tue Aug 3 21:49:56 EDT 2004

Replace them!  If they are mounted on the chassis and
you don't want to leave holes, then take them out of
the circuit and install the new ones under the
chassis.  New ones are about 20% the size of the older
ones, have closer tolerances (use the 20% tolerance
ones that are MUCH cheaper than the 10% ones and they
will still be closer than the -50% / +80% that the old
ones were!), and are very cheap from places like
Mouser ( ).

The hum is almost certainly coming from the bad
electrolytics in the transmitter and not from the

Glen, K9STH

--- "Alan W. Fremmer" <AWFremmer at AOL.COM> wrote:

On reading the article in the January 2004 QST, on
restoring a DX-100, the author Brian Wood, W0DZ,
suggests that adding capacitors to those already in
the circuit is an option for reducing hum.  He does
say that replacing is better than adding but the
former requires more effort.  I'm wondering if I can
reduce the hum in my DX-60A simply but adding new
electrolytics across those already there, or will the
AC simply find its way into the signal by taking the
shortest route.

Glen, K9STH

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