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I just came across some 4S1s and 4S2s!!! Dual-channel sampler plugs w/o timebases. What on earth were these used in? Anyone have docs? I'd like to know what sampling diodes are used in it if nothing else... One of them actually had a risetime of 0.1ns (~3GHz)!

The 4S1 and 4S2 plugins are used with the 661 scope
mainframe along with a 5T1 or 5T2 time base. I
believe this was one of Teks first attempts at
sampling technology. I think I have a scope or two and
some plugs if you or anyone else is interested in one
for their collection.

Jim Reese

--- Michael Dunn <mdunn@...> wrote:

I just came across some 4S1s and 4S2s!!!
Dual-channel sampler
plugs w/o timebases. What on earth were these used
in? Anyone have
docs? I'd like to know what sampling diodes are
used in it if
nothing else... One of them actually had a risetime
of 0.1ns (~3GHz)!

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At 12:53 PM -0800 2002/1/9, Jim Reese wrote:

The 4S1 and 4S2 plugins are used with the 661 scope
mainframe along with a 5T1 or 5T2 time base. I

That must be a massive mainframe, to take TWO of those plug-ins! Got a picture? (upload to our Pictures area)

md

Hi Michael,

Those are vertical amplifiers for the 661 sampling scope. The time bases for
the 661 had numbers like 5T1, 5T1A, and 5T3. In fact, those three were the
only timebases ever made for the 661. Two other vertical plugins were made,
however: the 4S2A and the 4S3. The 4S3 requires two P6038 active sampling
probes to work.

The sampling diodes were matched sets of 4 used in bridge configuration.
They were Tek-made GaAs and there was a bridge of 4 for each channel. The
4S1 and 4S2 used different diode sets. I think the 4S2A used yet a third
different set and the 4S3 had the sampling diodes located in the P6038 probes
and were different even yet. (P6038's were also used with the 3S3. 4S1
sampling diodes were the same as those used in the 3S76.)

If you don't have the rest of the system, those plugins are pretty useless.
Even then, they might be useless. I have three 661's but none of them have
been turned on by me yet. I suspect they are all badly broken as are
probably 90% of all 661 systems in the world today. I have some interest in
those plugins because they just MIGHT have a good diode set in one of the
channels which I think is going to be the hardest piece to find when I try to
get one of my systems up and running. So, I would be willing to do some
trading with you if your demands are not above my theshold of pain . . . Do
these plugins HAVE sampling diodes in them and what are the serial numbers of
the different units you have?

Stan
w7ni@...

Michael Dunn wrote:

The 661 is the same physical size as a 545A. There is a picture of one on
page 337 of my book.

Stan
w7ni@...

Michael Dunn wrote: