Image intensifier
Now for the Image intensifier tube. With the fiber optic input I suspect it's a Gen. 1+ tube?
Some ads from the 90's claim the PS-910 has a "hybrid image intensifier" and "brightness equivalent to second generation intensifiers".
Is it possible to tell Gen. 1+ and Gen. 2 apart when looking at the unpowered tube?
Photocathode
Phosphor screen
Image intensifier dimensions: 52 mm diameter , 50 mm height. Photocathode diameter 18 mm. Phosphor screen diameter 10 mm, without fiber optic.
Any clues what kind of tube I have here?
The outer case looks like some I have seen from DEP, in the inside there could be a XX1201 IIT. Of course this is just a guess.
The symptoms
When powering up, the input current is 127 mA @ 3V and a whining sound can be heard. The Tube does not light up.
The input current seems way to high, I expected 30-50 mA. It seems like the oscillator is working and I hope the tube is still alive but there is an insulation breakdown or a failure in the voltage multiplier.
Any information about possible failure modes of IITs?
For further tests I propably need to "depotting" the IIT. Any information how this could be done without harming the tube or powersupply?
if everything fails I might need to get a X-ray image of the intensifier to locate how to disassemble it.
Best regards,
Fleisch