[R-390] Re: Weak Receive Volume

[Gord Hayward]

It looks like there's an open in winding (carbon film) the RF gain pot. 
 It biases the cathode of the
RF amp so no current, no signal.  It might not be completely open so you 
get a bit of signal.  Deoxit?

Something looks like its driving the AGC negative (check the voltage on 
the back panel).  Failure
of  the .1 uF in the AGC time constant section might do it?

Cheers es 73 de Gord, VE3EOS.

-- 

Gordon L. Hayward, Ph.D., P.Eng.,
Associate Professor, Biological Engineering,
School of Engineering, University of Guelph,
Guelph, Ontaro, N1G 2W1.