Need TU10 Vacuum Sensors

From: Jay Jaeger <>
Date: Wed Dec 20 10:34:00 2000

I have a TU10 that has worked, generally, for the 10 years since I got
it. However, earlier this year it failed, with problems during the load

I have traced the problem to failed (and nearly failed) vacuum
sensors. The two "fail safe" sensors at the bottom of the two columns had
both failed (I suspect because during operation they were always in a low
pressure state), and one of the other sensors near the bottom of one column
had also failed. I suspect at least one more failure is imminent.

(The test is easy: if you can suck air thru it, its bad. ;-) I suppose
there is some kind of diaphragm in there which gets a hole it in when it

I was able to pull some from a DG tape drive, but clearly I need either
find a good supply of good ones, a supply of equivalents, or learn how to
repair the buggers (seems unlikely).

I have two different (presumably equivalent part numbers) for it:

The original part is:

Fairchild P/N PSF 100A

Another (probably replacement) is:

Micro Pneumatic Logic, P/N MPL 503. (These guys still exist! So I am
sending them an e-mail. But new ones are bound to be pricey).

Thanks in advance for any help.


Jay R. Jaeger The Computer Collection visit
Received on Wed Dec 20 2000 - 10:34:00 GMT

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