I replaced a tube In my Zenith color round TV. Mind you I don’t have any previous knowledge of tube TV’s and this is my first. I intend to use this TV as a learning experiences for a way to further my knowledge in analog technology. Any advice would be appreciated and for those who may get upset at my lack of knowledge and take solace in knowing That you can’t start with knowing, you have to learn, and this is my way I wish to.