Why wasn't this Zenith roundie repairable?

[Michelle]

The TV shop that sold/serviced our family's TVs is actually still in business, so they must be doing something right. (Their website shows they now have three locations too.)

I do remember that I liked the old TV better because I could often tune in channels from Providence, RI, and on rare occasion, from Maine. (I grew up north of Boston.)

But, the old one took awhile to warm up, and its replacement went right on.

An "E-F" model from 1975? I guess that's when the switch was made. (No remote control on either set though.)

You guys certainly know your stuff. Glad I was able to get some answers to something I've occasionally wondered about over the years.