[Hammarlund] HQ-129x recap

[Al Parker]

Hi Bill,
	Micas can/do go bad, but it's not yet a "shotgun" situation.  I just 
found 4 bad ones in an SP-600, all causing problems with the AVC, not 
with frequency.  I've had bad ones in R-388's and a few others, too. 
There's one in the R-388 that is a frequent failer, and I do replace it 
no matter what.
	Your non-linearity problem should not be caused by fixed caps or 
resistors.  Like Carl said, it could be the variable.
73,
Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 8/11/2011 10:17 AM, William A Kulze wrote:
> Perhaps I shouldn't call this a 'complete' recap. I only replaced the paper caps. Do the micas have a problem with aging? I've got a fluke that can measure the value, but it obviously won't show leakage. I've got an old IT-28 heathkit, but it needs a 6ax4. If I can't get rid of the offset in freq it probably won't be a big deal. The radio has the little xtal calibrator installed so I can at least get it to the nearest 100kc point.
>
> Bill W2NVD
>
> -----Original Message-----
> From: Carl [mailto:km1h at jeremy.mv.com]
> Sent: Thursday, August 11, 2011 9:55 AM
> To: William A Kulze; hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] HQ-129x recap
>
> Did you get the caps under the BFO cover? Many miss those.
>
> Check the banspread cap runout, it may not be perfectly centered or someone
> messed with the rotor plates.
>
> Carl
> KM1H
>
>
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