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

[Steve Reed]

Interestingly, it's definitely a factory original.  I have two HQ-180As
here, one that I'm working on and another as a spare for parts.  The spare
has the exact same configuration -- the filter cap is an 80-40-20.  I heard
back later today from Hayseedhamfest and they were wonderful to deal with
-- they'd only seen that configuration once before and also thought it was
a fluke, but they're manufacturing an 80-40-20 cap for me at no extra
charge.  Great people to deal with.  What I'd really like now is to find a
schematic for this one.

On Sat, Jul 13, 2019 at 4:56 PM JThorusen <jthorusen at centcoast.com> wrote:

> Greetings to Steve and the List:
>
>    My guess would be that someone replaced the filter cap in your 180A
> once
> before.   They probably couldn't find a four section cap with the right
> values in the universal replacement series carried by most parts stores
> back
> when, so they put in the closest thing they could find and used a separate
> axial lead cap for the audio PA cathode bypass.
>
>    The Hayseed Hamfest can should work just fine; you will have to do as
> Ken
> suggests and look around the audio PA stage (6AQ5?) for a cathode bypass
> cap.   If you find one, look for an unused wire in the harness that may
> have
> run between the original can and the tube socket.   If it is still there
> and
> has not been cut short, you can just hook it back up.   If it is missing
> or
> too short, you will have to run a neatly dressed lead between the tube's
> cathode pin and the new filter cap 50 volt section.
>
> Good Luck,
> Jim T.
> KB6GM
>
>
> ----- Original Message -----
> From: "Steve Reed" <kw4h at arrl.net>
> To: <hammarlund at mailman.qth.net>
> Sent: Saturday, July 13, 2019 14:33
> Subject: [Hammarlund] Re-Capping HQ-180A - Some Questions
>
>
> 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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