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March 20th 08, 01:16 AM posted to rec.radio.amateur.boatanchors

K3HVG[_2_] K3HVG[_2_] is offline

K3HVG[_2_] is offline

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Posts: 122

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hq180a help

wrote:
hi guys,
i'm in the process of restoring a 180a. tubes are good, i
changed the electrolytics. rcvr does need a bit of hf alignment but
works well now except for the last problem. so here it is...all
functions work well on the lower bands. when the 2 highest bands are
selected, triple conv. kicks in, am reception works well, but ssb & cw
does not. the ssb audio & the cw notes have a raspy or burbelly(for
want of a better word) sound. i can't understand why, because ssb &
cw work fine on lower bands. i have the bama prints, & poked around
checking resistance & voltages. can't find any far off. any help
would be greatly appreciated. it's a nice vy clean rig with clock &
noise blanker, i have matching spkr also. i want to set up an swl pos.
tnx pete k2iqk

I think you'll find that the conversion oscillator for the upper bands
is the problem. I had to work mine over (read: component re-build), to
include replacing the "good" tube and cleaning the socket. It was a
shotgun re-build but it did cure the problem(s) in the end. The
instability I had was genuinely a pain-in-the-%$#!

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