Old scope given new life

[brett]

Hi.  I've got on old (1960s?) Telequipment scope (now Tecktonics, I think).  Anyway, it died the other day (no trace on screen).  Yesterday I decided to lift the lid and look for what might be wrong.  After fiddling with it and getting a feint trace I accidentally touched a BIG electro cap in the back and got a blast.  Idiot! :oops: At least I was wearing rubber-soled shoes.  

But then I check the screen, and it's back up and running.  All I can figure is that I might have hit the chassis and shaken a few things as I pulled my hand outta there.

I feel double lucky today - I'm alive and I got the scope back from the dead.

[Sic]

lol, bittersweet.

[Boofhead]

A few times I've slid out the main inner frame and my fingers got wedged between the contacts on the rotary mains switch - literally, sniff, sniff, what's burning?

What model is it?

I've fixed these before, I might have a schematic.

(PS: Tektronics bought out telequipment - apparently it was a bad move on their part)

[computerjones]

ive got an old telequipment all tube scope that has been thru a couple basement floods i think.  it just quit working not too long ago.  the problem was that the horizontal axis lost its hold in the middle of the screen and now is somewhere too far to the right.  im suprised it lasted as long as it did, but still sad to see it go.  i doubt there is any way to fix it anyway.

[brett]

The old beast is an S32.  Amazingly, I found a manual for it on the web.  Maybe the X-axis hold was a weakness on these - the trace on mine has drifted off to the left.  The relevant trimmer is turned all of the way up.   But I still have about 1/3 of a screen of trace, so it's no big deal.

cheers

[computerjones]

i have to hit mine to get the trace to come onto the screen, so maybe there is some hope, but with all those tubes and corrosion who knows.

[Boofhead]

The main fault I found on the old tube units was the carbon comp resistors changing value or going open.  If both x and y have shrunk then it's probably EHT.  If it's only the x time sweep then it will obviously be in the sweep or deflection ckts.

[Peter Snowberg]

You might want to switch out any electrolytics in there too. They get really flakey after a while and the capacitance can go way up or down.

Good luck with it,
-Peter