OK, here we go! I ended up having to put the chassis on a box I'd have clearance for the CRT cable.
First, I check for continuity at the AC plug when the set was turned on. I got around 500 ohms which seemed reasonable.
Next, I powered it up without the fusistor installed just to make sure all the filaments would light up.
Finally, I popped in a NOS Workman 7.5 ohm fusistor, crossed my fingers and fired it up. After a little warmup, I was treated to a raster
I really didn't expect that on the first power up!
Now for the bad. No sound or video is getting through. No response at all to changing channels. I did the obvious things like wiggle the tuner and IF tunes and checked the connections, but no response.
I'll try injecting signals with a B&K 415 at both the input and output of the IF module. I've never even popped the cover off it so there could well be something wrong with it.