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After reading Dennis's message, it occured to to me to look up the 7S14 in a
Tek catalog. This is just a 1 GHz, two channel, 50 ohm sampler. Tek made a
lot of earlier versions of this technology that are a LOT cheaper on the
market than the 7K stuff. So if the 7S14 is really up to this job, you
might want to consider the following:

661/4S1/5T1A (there are other plugins you could use in this system: 4S2,
4S2A, 4S3, 5T1, 5T3)

561A/3S76/3T77 (and lots of other plugins and mainframes you could use
here, too: 561, 564, 561B, 564B, 3S3, 3S1, 3S2 [sampling heads required},
3T77A, 3T2)

There is also a 5000 series sampler: 5S14

The important thing to keep in mind is that you generally need some
mainframe, a sampling vertical, and a sampling timebase to work as a system.
Virtually all of the 661 system plugins will work together and virtually all
of the 561A mainframes and plugins will work together. It may be tricky
getting a system up and running, however. Fixing those old sampling systems
was sort of "black magic" even when all the parts (tunnel diodes and GaAs
diodes) were available new from Tek. Now, I suspect, you would need several
"donor" instruments to find enough good parts and then there is still the
"black magic" . . . I have read postings about using some fast Schotky
diodes in place of some of Tek's GaAs diodes but I have no personal
experience with this . . .

Regarding the "black magic", I can say this. In the late 60's, I was one of
the founders of an independent service company that specialized in only
Tektronix stuff in Southern California (it was called Mobilscope, Inc. and
we were based in Van Nuys, CA, and traveled Southern California in several
"calibration trailers" right to the customer's doorstep.) Anyway, fixing
and calibrating Tektronix sampling was our strongest suit and we used to do
them for most of the other cal labs in LA who had to farm them out when they
got stuck. We did a ton of them for large companies all over So. Cal. (No,
I am NOT interested in doing any for anyone else at this point in my life!
I have a bunch of old Tek sampling instruments and I hope to get several
systems running eventually, for my collection.) I would consult with people
who own some of this old sampling stuff and are trying to make it run,
however. Email me about it and I will see if I have any advice for you.

Stan
w7ni@...