I got it for free from my work at a chemical plant. It wasa well used and didn't fill any purpose longer. The equipment it was dedicated for was obsolete and thrown away. It had been resting on the shelf for several years with a broken knob.
I also got the original manual so it was
a pleasure to measure it up and fix the knob. The knobe I had
to glue two times before I had any success. After that I have
had problems with the sync. That was a IC with an array of transistors,
LM3086, hard to find. I got to know a guy from France, Jean-Jacques,
who helped me with a tip to use discrete transistors instead.
I did and it worked perfect. After that I succeded to find and
buy a few of the original LM3086 so that Jean-Jacque and me more
easily can serve our scopes in the future.
This autumn the scope broke down again. Then I finally dicede
to buy a new modern digital one as the "first" scope.
Anyway, I could not throw this old pice away, so I fixed it one
more time :-)
This time It was a short in the last bypass capacitor near the
first accelerator voltage plates. It was fed by the regulated
120V. The 120V current limit went in so that it was just 8 volt.
There was a 470 ohm serie resistor before this cap.
I wasn’t sure how to find what was the cause and how to disengage
different parts so I just dismissed the current limiter and then
the 470 ohm resistor showed where it sat :-) Some smoke showed
up at the right place. Change the resistor and the faulty cap,
back with the current limiter again and the scope is even better
then before because I adjusted the astigmatism pot a bit.
I still have a problem with the Storage function but I won't take
the time right now to fix it. It's of no interrest at the moment
because of my newbought digital scope. Here is three links to
the text, schematics and measuring pictures for the Tektronix
912 Storage part.
Please tell me your storys about your Tekscopes.
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