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The Zenith numbers for the tripler that I found are 212-141 and 211-141. I remember putting the NTE 526A in my set when the original one went bad. And looking in my box of triplers it seems there was some consistency in numbering them: there's the NTE 526A, which appears to be the same as the ECG 526A and the RCA SK3306 / 526A.
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