[R-390] speaking of AN/URM's

[Bob Young]

My AN/URM-25F has always has severe backlash since I bought it, I took it 
apart and found an adjustment that should have taken care of it, (it presses 
the worm gear against the round gear driving the variable cap). It was not 
even touching so I adjusted it down a little bit, put it back together and I 
have no RF output now, all tubes are good, I can't see where I did any 
damage, the modulation still works. Worst of all a little set screw fell out 
of it or it was a huge coincidence and I can't figure out where this came 
from. Anyone have any ideas or does anyone know a place where I can get this 
reconditioned?

Bob
KB1OKL



>From: "Richard Spargur" <k3ui at comcast.net>
>To: <r-390 at mailman.qth.net>
>Subject: [R-390] AN/URM-25J
>Date: Mon, 22 Oct 2007 03:00:56 -0400
>I have an AN/URM-25J on loan from a friend to use to restore a few R-390As 
>I
>have.  I am familiar with the AN/URM-25C, D and F models from military
>service starting in 1969.  Does anyone have a manual or some documentation
>that shows what an AN/URM-25J is?
>
>Richard
>K3UI
>