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Originally Posted by Nolan Woodbury
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?
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I looked at the Beitman's repair manuals and the high voltage transistor solid state hot chassis design doesn't show up until the 1966 issue. And becomes common in 1967. Earlier designs used power transformers.