[R-390] wow... the R-391A does exist

[Dave Merrill]

There's a short video of an R-391 in operation here:

http://www.geocities.com/ac_cars/R391.rm

(For some reason there is no sound - could be something with my laptop?)

I have an R-391 with the matching power supply and original cables.
It was in near new condx when I bought it 30 years ago - even had
the tools on the back panel, all covers, not one missing screw.

It's quite amazing to set one channel to WWV, switch to another
and return to WWV to find it still zero-beated.  How they achieved
this level of repeatability with 1950's technology still is impressive.

/dave
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