[Hammarlund] HQ-170 Audio

[Carl]

Duane, what are you talking about? WHAT abusive message and who is 
complaining. Is it just a crybaby with hurt feelings? I get them once in 
awhile and just roll with it and consider the source.
Be specific instead of broadcasting to the full forum in your first message.

Carl


----- Original Message ----- 
From: "Duane Fischer, W8DBF" <dfischer at usol.com>
To: "Carl" <km1h at jeremy.mv.com>; <k2cby at optonline.net>; 
<hammarlund at mailman.qth.net>
Sent: Monday, February 21, 2011 2:17 PM
Subject: Re: [Hammarlund] HQ-170 Audio


> Hello Carl, KM1H -
>
> I am receiving complaint messages from list subscribers about abusive 
> messages being sent to them from you. This needs to stop Carl. I do not 
> know precisely what is going on, nor do I need to know. It simply needs to 
> stop and stop now.
>
> I am commenting here because it involves more then one person.
>
> Enough said -
>
> Thank you for your cooperation.
>
> Not that those who are receiving offensive or upsetting messages are 
> adding fule to the seeming ongoing flames, but everyone involved needs to 
> step back, let it slide and get on with enjoying their boat anchors.
>
> Duane Fischer, W8DBF
> List Manager
>
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: <k2cby at optonline.net>; <hammarlund at mailman.qth.net>
> Sent: Monday, February 21, 2011 2:04 PM
> Subject: Re: [Hammarlund] HQ-170 Audio
>
>
> I mentioned replacing Z-2 yesterday which appears to have floated above
> anyones vision.
>
> Now I wonder how many commentors actually have a HQ-170 or have looked at
> the schematic before posting?
>
> That little circuit is known as a Couplate when its a Centralab and other
> companies have their own pet names. To any tech worth his price its known 
> as
> trouble and is automatically replaced. Now Ive seen several 170's using
> discrete components so cant say if Hammarlund changed in production, later
> in their Service Dept or it was done by someone else.
>
> The fix of course is to use discrete components and the values are on the
> schematic.
>
> If the noise is still there then at least one trouble spot has ben
> eliminated.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "k2cby" <k2cby at optonline.net>
> To: <hammarlund at mailman.qth.net>
> Sent: Monday, February 21, 2011 9:51 AM
> Subject: [Hammarlund] HQ-170 Audio
>
>
> Ray's note that turning down the audio gain control reduced but did not 
> kill
> the noise
> suggests to me that the source is something riding on the B+ buss.
>
> With the audio gain up, the noise would be amplified by the detector and 
> 1st
> audio stages
> and passed through to the output stage as a large signal.
>
> With the audio gain fully down, the noise would be greatly reduced but it
> would still be
> present on the plate and screen of the output stage only and would not
> totally disappear.
>
> In locating hum & noise troubles, I have had good success hanging a very
> large value mylar
> (.1 µF) or small value (2 µF) electrolytic with appropriate voltage 
> ratings
> from grid to ground,
> plate to ground, and B+ to ground at each of the various stages. When the
> noise vanishes,
> you have found the stage to troubleshoot. Just be sure to discharge the
> capacitor each time
> before reconnecting it.
>
>
>
> Miles B. Anderson, K2CBY
> 16 Round Pond Lane
> Sag Harbor, NY 11963
> Tel.: (631) 725-4400
>
> Fax.: (631) 725-2223
> e-mail: k2cby at optonline.net
>
>
>
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