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Pat:<BR>
<BR>
Assuming it is the caps, wouldnt the noise be there all the time? Wouldnt it affect the receivers ability to receive?<BR>
One thing I have noticed is that the crashing or static noise and the microphonics seem to appear once the receiver has warmed up.<BR>
And, there are times it is not there, sometimes for extended periods of time. Again, similar to my earlier experiences with tube equipment<BR>
which had noisy tubes.<BR>
<BR>
If the caps were bad, would the receiver continue to receive and be as sensitive as it should be? the static crashes are like one hears when<BR>
trying to conduct a qso with a thunder and lightning storm going on around you. That kind of noise and crashes. the microphonics are classic<BR>
reverbs and bumps when tapping on the front panel or cabinet. <BR>
<BR>
the receiver even holds its stability and doesnt drift at all. It functions perfectly with the exception of the static crashes which make it sound like<BR>
40 meters in a rain storm .. HI HI. and also the microphonics.<BR>
<BR>
Ray<BR> <BR>
> Date: Sun, 20 Feb 2011 18:51:58 -0500<BR>> From: wa4tuk-rf@comcast.net<BR>> To: rayfrijr@msn.com<BR>> CC: 1oldlens1@ix.netcom.com; hammarlund@mailman.qth.net; boatanchors@puck.nether.net<BR>> Subject: Re: [Hammarlund] HQ-170 audio<BR>> <BR>> There's a failure mode in the IF cans where the internal mica caps short <BR>> out. A symptom is loud crashing or static noises. It's something of a <BR>> pain to replace these caps but it is possible.<BR>> <BR>> Pat<BR>> wa4tuk<BR>> <BR>> <BR>> <BR>> On 2/20/2011 6:35 PM, RAY FRIESS wrote:<BR>> > The microphonics are still present even with the volume control all the way down.<BR>> > The noise (static like crashes) decrease with the volume control all the way, down but are still present, just barely though.<BR>> > By microphonics, I mean that when I tap the cabinet or front panel, you can hear the coming through the audio section.<BR>> > Before the noise started in the audio section, it was not present.<BR>> ><BR>> > I have had the receiver gone completely through by an expert in Hammarlund receivers. When he sent it back after going through it,<BR>> > he said it was as close to factor specs as he had ever been able to get a receiver of its age to.<BR>> ><BR>> > Ray<BR>> ><BR>> ><BR>> <BR> </body>
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