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Old February 23rd 12, 12:45 AM posted to rec.radio.amateur.boatanchors
Gregory Mosher Gregory Mosher is offline
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First recorded activity by RadioBanter: Feb 2012
Posts: 1
Default Help with Hammarlund HQ129X - What size paper capacitor is this?

Boatanchors,

So I bought a HQ129X at a hamfest last spring as a project. Seller had
started a recap job & decided to quit and sell it - price was right
for me. When I got the radio home I plugged it in - DOA. I found a
bad power cord, spliced in a temp and fired it up - the loudest HUM
I've ever heard - holy crap.

Anyways - I know how to use a soldering Iron but I'm in no way an
electronics person - decided to see what I could do - I bought a recap
kit for the receiver online and dived in this past weekend. Replaced
the electrolytic can, then all of the paper caps except one - more on
this one paper cap later.

I then replaced the power cord with a new 3-prong cord and fired the
beast up. No Hum (good). In fact the receiver works very well on MW
and SW bands, quite sensitve and fairly selective - I was pleasantly
suprized.

Anyways - back to that one paper cap - Any identification on rating
is gone from the cap itself - so I donlt know what to replace it with?
I supose I could just leave it but I noticed it gets very hot with
radio operation - the ones I replaced do not - so I suppose it's bad
and should be rerplaced? If I remove the cap the radio is dead -
Perhaps somone familiar with these radios can help me identify the
rating of this cap? It's of different physical size to the others I
replaced. The cap is direct connected between one of the pins on the
VR105-OC3 tube and the Relay connector on the back of the Chassis. I'm
not a wiz with reading schematics - Even though I identifed the tube
and relay in the schematic I was unable to discern the right cap in
the diagram.... Can anyone figure out the ratings of this cap from my
description of it's location and let me know?

Regards,

Gregory.