CTC-4 with an FJP?

[miniman82]

I have a supplement for the later CTC chassis (1960 on), which states that you must move all cathode wires to the same lug when using an FJP in place of a the CYP. I assume this must also apply to installing a later tube in place of the 21AX tube from a CTC-4, since the different phosphors require different drives to produce the same colors. Anyone have info on this? It's mainly a red thing, since the early reds were driven pretty hard because of their inefficiency.