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I'm not certain, but I don't think this radio has a transformer. Isn't a high-voltage output stage normal for transistor hi-fi and such? Might be the wrong forum for this discussion. Somehow, I've come to the understanding that solid state was popular and common by the early-to-mid 60s...at least it was in car audio.
I do know Zenith manufactured (battery) transistor radios before 1966...everyone did. Considering that, perhaps there is a transformer in there, or some pretty big soaks.
Are you sure about the dates wa2ise? Although I have to admit that even my later tube Zeniths (including the tube stereos) show the 99 MHz marker, my solid state Zenith console built in 1968 doesn't.
I'm sure Jeff will chime in and tell us when Zenith stopped broadcasting on that frequency. To me, that's the key in dating this radio.
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