One of my first tv's was about a 53 Zenith combo set with a Cobra Matic record player and a AM radio. It was free and I was exstatic to get my own HUGE TV. It had a very dim blury picture and was hard to watch in daylight plus about a quarter of the picture was gone probably due to bad tubes. I and my sisters still loved it and watched many late night weekend horror flicks on it. It was a 23" rounded tube set probably about 5 years or so newer then that set. Back in the day it was easier to make a safe CRT round, then the manufacturing process and materials improved and they started making square tubes.