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I think I remember reading where the solid state AA chassis came out sometime in '77 to replace the tube-type HE chassis. Of course, they could have continued production of the tube chassis for a while longer in order to use up old stock and I'm sure the tube version was offered at a lower price than the new solid state model. Years ago, I saw an early AA solid state set that used the same tuning knobs as the tube portacolor. The later Ax series sets used more modern tuning knobs. The newest tube portacolor that I've actually had my hands on was made in late-'76 and I've heard many reports from reliable sources that some '77 models exist. If any newer models exist, I'd love to see one.
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