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CTC-4 is definitely brighter, but it also has a stiff 25kv anode supply. The later sets all had better horizontal sections as well, not as good as a 4 or 21-CT-55, but the 5 is the only odd one out of the whole early color RCA line with respect to HV generation. I still would like to one day sub a different anode supply into a 5, to see if more HV would make it perform as well as the others.
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Evolution...
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