[Collins] R-388

[Gerald]

On Fri, 2005-08-12 at 12:34 -0400, K4deejim at aol.com wrote:
> While having a GPR-90 in the shack at the same time as the 51J4 and
> r-388 I found that the GPR-90 had much more comfortable audio. After
> looking at the design of each I found the GPR-90 used a little inverse
> feedback from the secondary winding of the output xmfr to cathode of
> the !st audio amp.     So while servicing the 51J  I got out the
> decade resistor box out and played around.     Installing a 225 k
> ohm , 1/2 watt resistor  satisfied  me enough that I soon after I
> parted with my  GPR-90  to enjoy the comfortable AM sound of the
> 51J .  
>   I used a standard full range 8" speaker ( NC-300 design) on each.
> Enjoy....Jim-K4DEE

SUPER idea!!! Next time I have my receiver out of the rack, I'll copy
that idea.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer