[NJARC] TOO much audio??

[Jim Whartenby]

Oops, replied only to Al.  


________________________________
 From: Jim Whartenby <antqradio at sbcglobal.net>
To: Al Klase <ark at ar88.net> 
Sent: Sunday, June 23, 2013 4:17 PM
Subject: Re: [NJARC] TOO much audio??
 


I would add to Al's suggestion any cathode bypass capacitors in the audio section.  Nothing worse then having a lossy electrolytic cap reduce the cathode resistor value and upset the tube's self bias voltage.  Same would go for those pesky paper coupling capacitors.
Jim


________________________________
 From: Al Klase <ark at ar88.net>
To: njarc at mailman.qth.net 
Sent: Sunday, June 23, 2013 4:05 PM
Subject: Re: [NJARC] TOO much audio??
 

Just remember
Reply = Poster
Reply All = Everyone

_________________________________________________________
Probably an AVC problem.  Read this: http://www.skywaves.ar88.net/commrx/Maintenance/agc.htm

If you haven't recapped. at least do the ones on the AVC bus.

Al

On 6/23/2013 2:57 PM, sgt88 at atlanticbb.net wrote:
> Just remember
> Reply = Poster
> Reply All = Everyone
> 
>
 _________________________________________________________
> After weeks of circuitry work...got my Grunow 1297 'working.'
> 
> Thanks!! to all for the great help...I truly needed it!!!...and the replacement IF from Mr. Dean kept this project alive...Thanks again, Dave.
> 
> I think something is unusual...I only have to turn the volume control VERY little...'bout 10 degrees...to get listening volume...after that LOTS of distortion and speaker cone wants to leave its surround!
> 
> The audio section has 2 each 6L6's fed by 2 each 6C5's.
> 
> Removing one 6C5 reduces the audio - naturally - and I can rotate the volume control to a 'more expected' rotation...but, still very little rotation for what I'd expect...
> 
> I have yet to check the voltages...I believe this can cause my circumstance??
> 
> Suggestions - continue - to be most welcomed.
> 
> Steve
> 
> 
> 
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-- Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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