Zenith porthole poor width question....

[Findm-Keepm]

Originally Posted by vts1134

I was more asking for education. What does putting a cap across the cathode and plate of the damper accomplish (besides increasing width )?

More coupling of the horizontal sweep to the yoke, I'd imagine. Weak drive, a weak flyback, poor B+ regulation, improper impedance match/LC between yoke and flyback, variances in replacement yoke/flyback - you name it, it can produce reduced horizontal sweep. I remember one Emerson portable that had a shorted IF tube, and gave us no horizontal sweep, just a vertical line. The lack of sound and reduced B+ gave it away.