I'm looking for some TV schematics. I have a Packard Bell cabinet TV year ranging from 50 to 53. I found a service receipt one the Cassy that dated 6-18-54 so the dating is just a Guss.

model # 2721

A sticker on the inside of the cabinet stated that the Chase type is 2720 & 2922 but i also found the numbers 2720 & 26553 so I'm not sure about that

can someone help me