On Thu, 08 Jan 2004 00:02:45 -0500, starman
wrote:



The purpose of bypassing (in parallel) the power supply diodes
(rectifiers) with capacitors (.010-mfd) is to remove RF switching
transients (caused by the diodes) from the DC output. This can often
eliminate the kind of hum which is heard when the radio is tuned to a
strong station but the hum goes away when the volume is turned down all
the way. Regular AC hum caused by a problem with the power supply filter
capacitor(s) can still be heard when the volume is down.



Hmmnnn...no pun intended of course....
http://home.computer.net/~pritch/shortwav.htm
This occurred to me too but if in fact the diodes were bypassed
and there was no effect I dismissed that source -- too quickly on
second thought, thanks.