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Tektronix 576 Curve Tracer Adapters

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NF6X:
Thank you!

Ugh, it sure frustrates me that I am stuck inside at work instead of playing with my new 576. Are any of you familiar with what should be behind that offset mult knob? If it's just a potentiomenter and counting dial mounted to the panel with a plastic bushing, then maybe my bashed one will just be a matter of fabricating a new bushing. But if that knob is supposed to be on a PCB-mounted potentiometer, then I'm worried about how much damage I might find inside.

jonpaul:
the damaged control for offset is a Beckman Helipot 10 turn prĂ©cision wirewound, with matching special 10t dial.  Most likely bent control shaft and ruined pot and turn counter dial.
They are 1979s classics, used,in a lot of mil and industrial, still made.  That control is seldom if ever used.

Check out Vintage Tektronix museum and Q service in Greece


Turn on carefully use Variac first time. look, listen smell for.PSU, HV faults.
Exercise all controls need cleaning.


Usual fail points.....CRT due to poor shipping package, or user misuse ( burning), loose CRT socket or nect pins, failing HV transformers and HV multiplier,
Scale factor   light pipe lamps ( hard to replace)

Left right switch is from Switchcraft.

Bon chance

Jon

NF6X:
Good news! The 10-turn pot and counting knob both appear to be undamaged. The plastic bezel thingy which secures them to the front panel broke, and I ought to be able to fabricate a suitable replacement. Maybe I'll 3D print something, or maybe I'll turn something out of delrin. I'm not yet sure about why they made that plastic bezel thingy instead of mounting the pot directly in a smaller front panel hole.

tautech:

--- Quote from: NF6X on February 04, 2023, 07:33:28 am ---Good news! The 10-turn pot and counting knob both appear to be undamaged. The plastic bezel thingy which secures them to the front panel broke, and I ought to be able to fabricate a suitable replacement. Maybe I'll 3D print something, or maybe I'll turn something out of delrin. I'm not yet sure about why they made that plastic bezel thingy instead of mounting the pot directly in a smaller front panel hole.

--- End quote ---
Check if Sphere have them:
https://www.sphere.bc.ca/test/tek-parts/tekpots.html

NF6X:
It works!

I temporarily kludged the 10-turn pot to not short out anything nearby, brought the power up with a variac, and tried out a random diode I had laying about. I'm sure there will be things to fix, and I bet I'll need to calibrate everything. But it lives! As I suspected, the readout intensity knob just needed to be turned up to bring the readouts to life. I see some dead "pixels", so maybe I'll need to dig into the readout bulbs?

I'll start ordering necessities like tin/lead/silver solder. I'd like to find one of the safety covers so I don't have to fabricate one from scratch. I have one of the FET adapters sitting my in PO box waiting for me to pick it up already, and I still don't know how the other FET/BJT adapter differs. The only one I see listed is part of an expensive lot of 4 adapters.

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