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Another trick is to inject 60 hz ac from the filament supply through a .047 or so cap into the vertical amp/oscillator on tube sets to check out a "no vertical" condition...the speaker trick sounds interesting. You maybe could use it on tube sets as the vert output transformer is like an audio output trans. but sometimes it's an auto transformer and there is high DC voltage at the yoke leads.
That's great that you got those magnets remagnatized Andy...you maybe could also use something like an auto headlamp or 2 or something like that that draws a lot of current in series with the coils to limit the current but still allow a high amount to flow.
Thank goodness for the world wide web, I have learned so many valuable troubleshooting tips from it.
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