[beery]

Hi all,
Thanks again for people's encouraging comments.

I've attached the diagram for the vision TRF section. Do have a look, it is very unusual. If I had not drawn it out then I would have put the detector valve in the wrong socket for sure.
I've never seen push-pull video drive before. However I assume that vision output 1 is for the CRT (as it has a peaking coil) and vision output 2 is for the sync separator. I've not traced out the CRT connections, so I can't say for sure.

Cold checks have revealed that R8 has increased in value by 10 times and is looking decidedly brown. R14 is also high an a little bit discoloured.
The really odd fault is that VR1 is open circuit at both end connections, in that there is no reading between them and no reading between either terminal and the wiper irrespective of the wiper position; that's a new one on me.

I'm not sure how much more work I will do on it for the time being as I am gearing up for a trip to Malaysia in a couple of weeks, so I really do need to take time out to pack...

Cheers
Andy