[R-390] HP 8640b

[frankshughes at aim.com]

I really wanted an HP 8640b, but when I Googled, I found so many folks trying to find repair parts
w/o any luck that I went w/ the old, trusty/rusty URM-25. 

Particularly interesting was one guy who claimed to have bought 4 broken HP 8640b's and his humorous 
report about trying to get one working unit from the piles'o parts.
?
As previously mentioned, when left to warm-up and stabilize, my URM-25 holds frequency well.

The only thing that was wrong w/ it out-of-the-box from Fair Radio was no signal in two bands.

There is so much documentation on how to troubleshoot & repair the URM-25 that I suspect mine will 
have the missing bands restored in short order.
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