Size, weight and cost.
The last large crt tv I worked on was all crt inside. The plastic case was molded around the tube. I think it was a 32". The circuit board was only about 8" x 10". And I could lift it myself. A 32" all tube console took two people to lift. 20 or so tube cluttered inside around the crt. Just to heat the filaments on those 20 tubes took 25amp at 6 volts. High voltage! Zenith anode voltage was 35kv on their larger unit. 42.5 rings a bell. CRT convergence was touchy to get a sharp image. With age the crt would go gassy. The red, blue and green color guns would go weak and need balancing. My dad spent $850 in the 60's for our color tv. I kept it going into the 80's. Glory hallelujah they are no more.
The last large crt tv I worked on was all crt inside. The plastic case was molded around the tube. I think it was a 32". The circuit board was only about 8" x 10". And I could lift it myself. A 32" all tube console took two people to lift. 20 or so tube cluttered inside around the crt. Just to heat the filaments on those 20 tubes took 25amp at 6 volts. High voltage! Zenith anode voltage was 35kv on their larger unit. 42.5 rings a bell. CRT convergence was touchy to get a sharp image. With age the crt would go gassy. The red, blue and green color guns would go weak and need balancing. My dad spent $850 in the 60's for our color tv. I kept it going into the 80's. Glory hallelujah they are no more.