It's the tripler. Especially if it's an original. I just replaced one in the '77 Sylvania GT Matic I have here.
I was able to cross reference the Sylvania part number with a little googling. Mine ended up being this one:
http://www.ebay.com/itm/291059760580...%3AMEBIDX%3AIT
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"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
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