My 1960 Zenith space command 300. Was used in the barber shop I used to go to, Got it sometime in the eighties from the owner of the shop when he retired it after having an if problem.
Finally got around to check it out and found the heater pins corroded on one of the if tubes, Now it works great!
Now that I remember, He replaced it with a Zenith 19" he bought new from highland appliance, The tube didn't even last a year! That was in the mid eighties when Zenith started slowly going downhill in customer satisfaction and quality
