New enthusiast

[Electronic M]

Depending on the set the CRT is either mounted to the chassis or mounted to the cabinet. If it's mounted to the cabinet you should be able to unplug the yoke, CRT socket, and HV lead to remove the chassis. If the CRT is mounted to the chassis then the chassis and CRT must stay together until the pair has been removed from the cabinet. Chassis mounted CRTs normally separate from the chassis by pulling from the front (after fasteners and mounts have been loosened or removed).

This may sound a bit stupid but on chassis mount CRT sets if the mounts seem sturdy I don't bother removing the CRT for servicing, and simply turn the chassis /CRT assembly on it's side to service it.