[Heath] AR-3 - another question

[Kenneth G. Gordon]

On 18 Apr 2016 at 20:17, Glen Zook wrote:

> I have both an AR-2 and an AR-3.  On the AR-2 it takes 2.5 turns on the main 
> tuning knob to go from end to end on the dial and on the AR-3 it takes 3 turns on 
> the main tuning knob to go from end to end on the dial.

All of mine do too, but I am almost certain that is not correct. Most of those BC-band dual 
tuning caps which have the two-different-sized shafts WERE reduction geared, but in my 
experience, since they were very "lightly" built to begin with, they very shortly froze up. I 
have a couple of those NOS which still work correctly, but those I have do not have the 
correct capacitance to replace the one in the AR-3 with.

> As for the "hum" when in the CW position:
> 
> Check the 12AV6 and the wiring around it.  Also, replace the 20 mfd capacitor 
> from Pin-8 of the 12V6 to ground.

I replaced the 12AV6 and that made a big difference, and I also found loose ground 
connections all over the place. I'll fix all those next.

Thank, Glenn.

Ken W7EKB