[R-390] R-392

[David Wise]

Letting a tube run at zero bias is just wrong...

Dave Wise

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Johnsay Johnsay
Sent: Friday, January 24, 2014 11:38 AM
To: r-390 at mailman.qth.net
Subject: [R-390] R-392

The 26A7 has always been the fly in the ointment with the R-392.  A 16 watt heat sink that produces a quarter watt of lo-fi audio.
The audio quality is at least acceptable with the military headphones and handset.  Pretty bad with a directly driven speaker,  impedence matched
or not.  I'm otherwise very fond of these radios.  Mean and green....
My solution has been to use a set of computer speakers (or alternately a PA amp) directly connected to the audio.  Sounds good but leaves the 26A7 intact.  I think the best solution is one that eliminates the 26A7 and bypasses the existing output transformer.  I'd be willing to play around with mods though.   I have a couple R-392's and a free standing audio module.
 
John  W8KX
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