Damn it, it is now dead! It is powering up, the relay clicking in, the CRT is certainly alive but no trace. No bright dot or anything, nothing beyond some random CRT glow if I crank the intensity control right the way up. Not a plug-in thing, it is a consistent fault with both the G and CA.
I have been cleaning (it will take months to really get the dirt out of this thing) so I guess I may have killed something. I was last cleaning around the area I fear the most which is the solid state stuff. I’ve certainly not “broken” anything, no wires off, shorts or anything, but I guess I may have static-killed a transistor despite earthing myself. I was cleaning the general area and replugged the transistors, which were filthy. This is in the vertical amplifier section so may well be relevant, though I don’t understand why there isn’t a bright dot if there is no deflection.
Any ideas what to look at first, what to measure to narrow things down a bit?
My instinct is just to replace all the transistors as they are all tarnished and pretty ugly, but that won’t be easy as they seem obsolete and getting hold of them will be tricky. There is a good Tektronix community though so it should be possible.
PS Obviously this may be coincidental and something unconnected to cleaning has failed. It is obviously old. I am crazy careful about things and I’ve certainly not physically broken anything, e.g. all transistors have the same number of legs they started with and are in the correct orientation in the socket they were removed from.