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If the 1975 RCA tube manual is correct the 23CP4 crt is a 8 pin keyed button base 110 degree tube. One h--- of a change. 10SP4 again if before said manual is correct is a 50 degree tube. The different h.v. needs could cause diffacuilty. I would go back to the tube that was in set and see what happens,and go from there. All the best, Tom.J
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