That would have been cool to see! I remember one of the days when I stopped
over at the Rockwell Inventory Disposal store. They had a bunch of these
frequency standard crystals (not to be confused with the crystal filters) in
vacuum tube types of envelopes. I bought a few of them and gave them away as
gifts to some of my friends. I've still got a couple of HC-49U crystals in
glass envelopes. One of them is 3.0000000000MHz. I'll find a use for it
someday.
I like those Racal receivers...........for the longest time I was looking
for a 6790, and Ken Ganinno, down in St. Louis had one available. I had a
KWM380 that was in pretty good condition so we made a trade, and I haven't
looked back. Last time I spoke with Ken, he was pretty happy with the '380.

Pete

wrote in message
ups.com...
That Racal had vacuum crystal filters too! ;-)