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I used to change a lot of those color output transistors in Zenith hybrids years ago. Also resoldered a lot of the grounds at the ends of the connection strips. I beleive the transistors replace with an ECG 154 / NTE154, has a round case with a heat sink pushed on the transistors. I would always put a little heat sink compound on it to make sure it made good thermal contact with the push on heat sink.
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