[R-390] S&W R-390A, It's ALIVE!

[Roy Morgan]

On Oct 2, 2009, at 7:12 AM, mikea wrote:

... when switching between AGC and
>> MGC, the RX goes quiet for about 30 seconds, sometimes. ...
> ...
> I've got one R-390A that does the mute-for-30 when I move the AGC  
> knob.

You will get more precise help with this trouble, but I suspect things  
amiss in the AGC system, and for some radios, this is kinda normal.   
The capacitor that's put into use in the AGC SLOW mode is involved  
with a tube section to in effect mulitply the value of the cap.  Read  
the manual on this.

Any leaky caps in the AGC system can cause trouble. Best route is to  
replace them all.

Better yet, do the AGC modification that was  not long ago described  
in ER.  It solves ALL the problems with the R-390A AGC system.

Roy


Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073
Home: 607-898-3607
Cell: 301-928-7794