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As far as I can remember, the 6BK4 and CRT are on the same filament winding and this has a DC bias voltage applied to it to minimize heater to cathode voltage difference. The 6JE6 should be on the same filament winding as the rest of the other tubes.
I have a CTC-39 and the 6ME6 horiz output tube just burned out its filament from so much use. A new 6JE6C/6LQ6 fixed the problem. Have seen cases of bad sockets too so a known good tube swap plus voltage check at the socket pins should find the trouble.
I would be cautious of the diodes in the bridge rectifier here...have seen several cases of bad shorted diodes. You want to be sure it is actually operating on all 4 diodes...I'd just replace as they are so inexpensive.
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