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Although the 38/39's have been very rare, I have found a lot of the RCA portable tube color sets at second hand stores and flea markets (CTC-36, 52, 53). I bought one that was turned on and playing at the salvation army.
The HV/flyback system on these sets seems to be more robust or run under less stress than the 31/38/39. Only real big problem I've seen on the portables has been some burned yokes on 2 ctc-53's I have.
If RCA had just changed to a solid state tripler or better flybacks on the CTC-39's there would probably a lot more around today.
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