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Yes, the 526 has the built-in focus resistor and is a direct replacement for the original Zenith tripler with the built in focus resistor. I actually have a 25EC58 flat chassis and the tripler in it crosses to an NTE526 and it is the one with the self contained focus resistor. I think the tripler is actually bad in my set. It has HV; but, the picture is too bright and there does not appear to be the proper output at the REF terminal on the tripler; which, is tied in to the brightness limiter circuit. That set is buried right now and I'd like to fix it; so, I'll someday be looking for an NTE526 myself.
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