[R-390] Carrier meter Dead

[Frank Donnelly]

I have aDittmore-Friemuth R-390A , and the Carrier meter does not work.
I can zero it with the carrier adjust. I tried replacing V-503 6BA6 3rd 
IF tube and V-504 6AK6 4th IF tube but still no good.
Before I start digging any furtherI figured better to ask first.
The R-390A has been recapped and aligned and then sent to Rick Mish for 
checkout and realignment.
It works fine but no movement other than a slight tick when I sw. from 
MGC to AGC.
If I tune in a strong AM carrier, no movement on meter.
Any suggestions from the group would be appreciated.
Many thanks  Frank  KI0RQ