Thank you Fraser and Bill for all the help and advice on this series 80, but i have had no luck recomissioning the power supply.
The 12 battery input bypassing the 240v transforer did not help as the output voltages were still missing.
Replaced 2 suspect mosfets to no avail, i think power distribution pcb with the focus pots etc has succumbed to age (i know what that feels like).
I should have taken Frasers sage advice ad not spent so much time and effort on it.
But all is not lost. I have TIC fever now and got my wife to buy me a DH-BF5421-T for my birthday. It came with a blackbody and 2 tripods.
My plan is to install the microbolometer in the series 80 body where i can utilise the large 35mm f.07 lens and the focusing servo.
So far so good as im getting great images in preliminary tests. I just have to fabricate a carriage to get the sensor centralised. Ill post on this seperatly.
But this means all the boards from the series 80 are available for spares along with the pevicon tube. First refusal to Fraser and Bill. DM me if they are of interest.