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I think that these very early solid state sets such as the Astronaut used a tube HV rectifier...even the RCA CTC-40 used a tube HV rect. There is a little Sony 5" solid state portable from 1968 uses a 3-tube HV tripler.
Another unique thing about the Astronaut is that it had a built-in battery pack that recharged when the set was plugged in.
I don't think that solid-state HV became really popular until the early 1970's.
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