Quote:
Originally Posted by old_coot88
The first guess would be a weak H output tube of couse. Your set probbaly uses a 6BK4 HV regulator. In later Zeniths using beam triode (6HS5, 6HV5 etc.) regulator, a gassy regulator can cause loss of width. The only test for these is to sub the tube, even though it tests 'good' on a tester.
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This set uses a 6HS5. I subbed that with a NOS one too and it made no difference. I'm guessing a cap or resistor somewhere. The Horizontal oscillator is part of a 6u10 triple triode compactron. I subbed that too. Basically, I did all the easy stuff first hoping for a low effort solution.