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Really, No arc at the 6cb5. This is interesting. Check for the b+ at the fuse at both ends, M4 on my sams 3/4 amp It Should be around 380-390 volts. Also please check the horz tube plate cap. With it disconnected from the tube, Check and see if you get a voltage reading. If b+ is on the fuse and horz plate cap try replaceing the horz out and damper tubes. They may check ok on the tester but when in circuit and under load they don't work.
Also do you have a variac? And what is the ac line voltage you run the set at?
ED
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