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I'd look to see if the 1B3's lit up, assuming you can see the underside safely while the set's on. You might need a dim room. Be very careful. You'll see the filament's slight dull red glow, which might be brighter than that, sometimes dull orange.
I like to use an HV probe, though - it's far safer.
If there's HV, then you might need to adjust the ion trap.
Realistically, if the set hasn't been recaped, I wouldn't even expect a raster...
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