[Hammarlund] HQ-180 hum in CW mode

Roy Morgan k1lky68 at gmail.com
Sat Nov 29 15:12:23 EST 2014


On Nov 28, 2014, at 1:03 PM, Charles Ochs <chuckochs at hotmail.com> wrote:

> ...Can capacitors should ALWAYS be considered "suspects" and must be carefully eliminated before proceeding onward to other things. Without a healthy power supply, the radio can not be expected to operate properly….if these caps are not bad now, they will be shortly--so just replace them.

Charles,

I well know about this advice.  I should take it directly to heart and fire up the soldering iron.  I have a Heath bench supply (the IP-17) that I expect will see long and frequent service. It will be especially useful in testing and reforming capacitors, and in making gadgets such as the converters I need for the BC-779 here.  It has some 6 or so electrolytics in there, in three different B+ or B- supplies.  I really should replace them all!  Then I will rest easy about it running without failure or trouble for a long time.

These caps are PC mount parts: two or three contacts on one end of a non-metallic tube.  I can mount axial electrolytics on the board, with some insulation on high voltage points, and all will be well.  I won’t go to the trouble to stuff the old tubes with new parts - this is not a historic radio restoration.  I might do that for a 1929 Atwater Kent, though.

Roy


Roy Morgan
RoyMorgan at alum.mit.edu
K1LKY Since 1958



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