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Dammit.
Set has been gradually losing control over vertical hold over the last six months and now it finally reached the point where after a few minutes no fiddling with the vertical hold will cure it. Looking at my old worksheet I've already changed out the resistors around the vertical hold control and the 12BH7 still tests good but there's three other resistors around that tube I can only suspect are drifting out as they warm up.
Back onto the bench it goes. UGHHHHHHHH.
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