[Boatanchors] [Hammarlund] HQ-170 audio

[Bob Macklin]

Try tapping on the tubes!

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"

----- Original Message ----- 
From: "RAY FRIESS" <rayfrijr at msn.com>
To: <1oldlens1 at ix.netcom.com>; <hammarlund at mailman.qth.net>; 
<boatanchors at puck.nether.net>
Sent: Sunday, February 20, 2011 3:35 PM
Subject: Re: [Hammarlund] HQ-170 audio


>
> The microphonics are still present even with the volume control all the 
> way down.
> The noise (static like crashes) decrease with the volume control all the 
> way, down but are still present, just barely though.
> By microphonics, I mean that when I tap the cabinet or front panel, you 
> can hear the coming through the audio section.
> Before the noise started in the audio section, it was not present.
>
> I have had the receiver gone completely through by an expert in Hammarlund 
> receivers.  When he sent it back after going through it,
> he said it was as close to factor specs as he had ever been able to get a 
> receiver of its age to.
>
> Ray
>
>> From: 1oldlens1 at ix.netcom.com
>> To: rayfrijr at msn.com; hammarlund at mailman.qth.net; 
>> boatanchors at puck.nether.net
>> Subject: Re: [Hammarlund] HQ-170 audio
>> Date: Sun, 20 Feb 2011 15:11:40 -0800
>>
>>
>> ----- Original Message ----- 
>> From: "RAY FRIESS" <rayfrijr at msn.com>
>> To: <hammarlund at mailman.qth.net>;
>> <boatanchors at puck.nether.net>
>> Sent: Sunday, February 20, 2011 2:54 PM
>> Subject: Re: [Hammarlund] HQ-170 audio
>>
>>
>> >
>> > The audio output of my HQ 170 has become very noisy and
>> > microphonic.
>> > Does anyone have spare audio driver and audio output tubes
>> > they would be willing to part with?
>> > Thanks
>> >
>> > Ray wa7itz
>>
>> Are you sure its a tube? Both the driver and output
>> tubes run wide open all the time, the volume control is
>> before the 6AV6. If the microphonics is not varied by the
>> volume control its probably coming from the 6AV6 which is a
>> high gain tube. But... make sure there are not bad
>> connections around it, poke the circitry and wiggle the tube
>> to see if it makes any difference. Sometimes cold solder
>> joints or a composition resistor that has cracked can act
>> like this.
>> Also, just pull the 6AV6 and see if the noise goes
>> away, that will eliminate the output tube.
>>
>> --
>> Richard Knoppow
>> Los Angeles
>> WB6KBL
>> dickburk at ix.netcom.com
>>
>>
>
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