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General CRT removal procedure: Remove back of cabinet, unscrew main chassis and unplug plug-able wires connected to main chassis (note where they go), if tuner sub-chassis unplugs (haven't seen that on an RCA) unplug it or remove tuner sub-chassis from cabinet (there should be a piece of metal on the back of the tuner chassis that can bolt to the screws on either side of the cord interlock for safer transport...do that), remove main chassis from cabinet, set cabinet face down and remove screws/bolts that hold CRT in (usually at the corners), unscrew convergence board, if possible lift the CRT, it's mounting and neck hardware and convergence board out as a unit (it's usually an unnecessary pain to remove, reinstall and properly readjust the neck hardware), have a towel, rug, or some soft thing to set the CRT on ready so CRT face does not get scratched.
I recommend wrapping the convergence board and it's wires around the deflection yoke shroud so they don't flop around, and recommend bolting tuner to main chassis for the same reasons. Be careful things don't bump things on the boards I had to do a lot of extra work and parts sourcing to a CTC-20 roundy because a previous owner did not bolt the tuner sub-chassis on and let it flop about and damage things.
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