Philco Predictas
Awesome as they are, the Predictas are prone to trouble. All of that heat being generated inside a small box got everything frying in fairly short order. Most restorations involve a peripheral fan to keep things cool, but generally it's not a good idea to operate a Predicta for too long at a time. My guess is that the "barber pole" models are the most difficult to find. They looked to be extremely top-heavy and entirely inappropriate for earthquake country households.
We had a 1951 Capehart for our first TV. Model 325-F in a maple cabinet. From the dates on the ads above, it appears that 1951 was the first year Capehart offered a rectangular screen. Ours was big and heavy, and was hard to justify saving as a result. I sold it as part of my mom's estate sale a few years ago. It's also a much more complicated than average set for its day, and would require a more involved and extensive restoration.
That 30" Dumont is impressive. I'll bet it's downright impossible to find replacement CRT's for those. Many sets of similar vintage that have small screens survived with good CRT's because by the time they started to have problems, the CRT had plenty of useful life left, but most people opted to buy a new set with a larger screen rather than fix the old small screen one. Lucky for people like me, sets like my 1950 Admiral 10" bakelite "Consolette" was sent to the attic or other storage space for the next 25 years before landing in a thrift store. I got mine for $5 in 1980 and had it re-capped for $100 several years ago. It sits in my guest room now and I will watch it once in a while. The technology is primitive, and even on a 30" Dumont screen there would be compromises with level of contrast from scene to scene, so early TV's are best appreciated for what they are.