[Milsurplus] URM-25D...follow-up...

[Kenneth G. Gordon]

Well, I opened my ' 25D last night. Absolutely immaculate inside. After I 
DeOxited the turret and reassembled it, there is no more drift on bands 
9.5 Mhz and above. Stable as a rock after I let it warm up a 
LOOOOONG time.

One of the little #323 lamps is toast though. Anyone know where I can 
get a couple? I managed to get the bad one apart, but it looks like it is 
press-fitted into some sort of nylon cylinder. I thought the #323 lamp 
was mounted in some sort of collared metal cylinder.

I still have hum, more noticeable as I go up in frequency, but I have not 
changed anything yet. I'll gather the parts, read the 73 pages of notes I 
found on the internet, and buy Hollow State News and Dallas Lankfords 
notes before I dig into it. It is working pretty well for now.

I found an added circuit board in it which had 3 diodes (one is probably 
a Zener) and 2 ea 2200 mfd 10VDC electrolytics on it. Looked to be 
factory, but it sure isn't on my schematic. Possibly a regulated DC 
supply for the oscillator filaments? Anyone know? Anyone else ever 
seen one of these mods?

Sure smelled good in there...

Ken W7EKB