[Milsurplus] URM-25D...follow-up... (Kenneth G. Gordon)

[Brooke Clarke]

Hi Ken:

I have found that contact failure is the most common reason things go 
bad, but am not familiar with DeoxIT.
http://www.pacificsites.com/~brooke/HaT.shtml
I checked their web page and there are a number of different ways it's 
packaged.
http://www.deoxit.com/

Can you tell me the type you recommend?

73,

Brooke Clarke, N6GCE
http://www.PRC68.com

>From: "Kenneth G. Gordon" <keng@moscow.com>
>To: milsurplus@mailman.qth.net
>Date: Tue, 30 Sep 2003 23:12:27 -0700
>Subject: [Milsurplus] URM-25D...follow-up...
>
>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
>
>
>  
>