[Jeffhs]

I wish I would have known this when I had a Zenith SC300 19" b&w portable in the late '70s. It was a trash day find in my old neighborhood. The set worked (until the horizontal output tube [22JF6 or such] went gassy a year later; could never find a replacement), but the remote was missing. Had I known then that the Zenith ultrasonic remotes were interchangeable with one another, I probably could have gotten the remote functions to work. The rest of the remote system seemed to be there and intact, except there was no manual channel change button or bar on the front of the set (one manually turned the channel selector to change channels) and no manual channel selector knob on the back. It also occurred to me that perhaps the set's former owner may have either disabled or removed the motor drive mechanism from the tuner, possibly after losing the remote (!), since the tuner operated so smoothly -- no resistance from gear drive ratio reduction schemes.