Hi Mark,
thanks for the link. I'll have a good read through it. As for further failed tantalums, that could well be the case as the video amplifier is still not running correctly. Fortunately the 'parts-donor' unit still had this module and that one does seems to be working.
I've removed the Yig and have been looking for clearer disassembly images or videos but without luck as of yet. Before I attempt to open it, when I get some time, I'll look through the manual and see if the lack of vertical deflection might be on one of the plug-in boards.
There are 11 of the bolt-connected modules, from the underside, which I had intended to test, but I'm not prepared to risk any further damage.
Thanks
James
James55