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Some regard the 25MC33 as the best performing roundy chassis .
Really all Zeniths in the 60's were about the same. Several chassis had vertical transformer and linearity coil failures and early 60s roundys had the disintegrating convergence yoke plastic issue. Late 60s sets with single knob UHF/VHF tuners could experience gearing issues in the tuner.
If you go rectangular some of the late 60s hybrid sets had a Solid State IF system in a big shielded box.... Those tend to have a razor sharp picture when the focus is set right. My 15Y6C15 portable, 20CC50 23" woodgrain metal table set, and my 12B13C52 Boyden console all have remarkably sharp picture...when set up right you'd have a hard time telling the picture from that of a 90s Solid State set.
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