[R-390] Servicing Advice on Signal Generator URM-25D

[pdulaff at earthlink.net]

Bob

Thanks for the input. I have it on the bench now. It is very well built. 
There aren't any black beauty caps in this thing. They use metal tubular 
decoupling caps that is flange mounted with a glass seal for the terminals. 
Resistors look like new but I will check them for increase in value. The RF 
choke that shorted to ground looks like the plastic terminal that holds the 
end of the wire had cold flowed over the last 40 + years and changed shape 
enough that the terminal contacted the ferrite core of the choke and shorted 
that side of the choke to ground. I have the manual for the unit and was 
studying it since I figured I had better check both frequency and signal 
output calibration after I get it back together. Another thing to consider 
on these units is lubricating the worm gear for the turret drive . Works OK 
but the grease is all dried out.

Paul - WB2NMI