Bummer about your 7D20, but aren't they amazing devices?  I love the
tiny little text they generate...  Another project I may (never?) do is
whomp up an outboard power supply so all you need is an XY display to
use one of these.  It could happen.

It might be a useful thing to have, to use certain other plugins with
(like the 7A13 & 7A22 diff. amps, especially, but really any 7000
amplifier, for general purpose, um, amplification)

I assume you checked Sphere Research's site at
<http://www.sphere.bc.ca/test/tek-parts/tekparts3.html>.

There's also a Yahoo group that loves this stuff, can't hurt to ask
there. One of the regulars has the biggest Tek collection around, and
sometimes parts old units out. I could keep an eye out at MIT Swapfest
next month, too.

> "Christian A. Weagle" <cweagle@i9t.net> wrote:
> > I have this old piece of Tektronix gear that plugs into their analog
> > 7000-series scope mainframes, called a 7D20.  It is a 3-slot wide 
> plugin
> > that is basically a digital scope that uses the mainframe for power 
> and
> > display.  It is two channel, each 70MS/sec, which is plenty fast for
> > much of what I need.  And it also has this GPIB port on the front...
> 
> I sympathize with you, because I also have a 7D20 that I like very
much.
> Unfortunately, mine has a bad custom Tektronix analog IC in the front 
> end,
> so it only has one working channel at the moment. If you come across a
> source of parts, let me know. I've already gone through all of the Web
> resources I could find, and I'm going to be scouring the flea markets
> and hamfests this summer.
> 
> As far as GPIB, all I can tell you is that there was a proposal to 
> Circuit
> Cellar last year for an article for a "low-cost RS-232 to GPIB 
> converter".
> I suggested that with the disappearance of RS-232 ports on modern PCs, 
> it
> might be a good idea to throw in an FT232/FT245 and turn it into a 
> direct
> USB-to-GPIB converter. Unfortunately, we never heard back from the 
> author.
> 
> -- Dave Tweed

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