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I'm betting it's a CTC-38 or 39 because the set has the "modern" RCA logo on the front which RCA started using in late 69. I'm not familiar with the CTC-36, and I'm confused.... if the chassis says 21ctc36xc, why would you think it's a CTC 21? Also, the 6BK4's always look dark, but if it is bad, in most cases, you do not need to change all of the HV tubes. The weak point in ALL RCA's, ESPECIALLY the CTC-38 and 39 is the flyback. If the flyback did go out, it is best to change all of the HV tubes.
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