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Those were made from about '75 until '80, when they were replaced by the E32 single-board chassis with an IHVT.
On your set, triplers were a high-failure part, as well as the filter capacitor and bad solder connections. I ran into a few bad yokes and a number of weak tubes on these. When they're right, they have a nice picture. I think the tripler on these is an NTE523A.
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