[Hammarlund] Re-Capping HQ-180A - Some Questions

Steve Reed kw4h at arrl.net
Sat Jul 13 17:33:00 EDT 2019


Hi all -- I've got a HQ-180A here and and started the re-capping process.
The replacement power supply filter capacitor that I ordered from
Hayseedhamfest is rated: 65-45-45 (at 450v) and then there's a fourth pin
on the can rated 45mfd at 50v.  The ACTUAL filter capacitor on my HQ-180A,
however, is rated 80-40-20 (450v) and there is no fourth pin.  To add to
the confusion (and just to make it hard for me to trace a lot of this out),
the only manual I have for a HQ-180A identifies the filter capacitor (C82),
as a 60-40-40-40 at 450v.  So this is wandering all over the place.  So, a
couple of questions:
1 - Is that Hayseedhamfest cap a direct replacement regardless of the
difference in the ratings?
2 - Does anyone have a schematic for the version of the HQ-180A I have?  I
realize there were many different production versions.

Thanks - Steve, KW4H


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