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Probably not..since by the time Nuvistors came on the market, transistors had been developed to the point of nearly 100% use in portables. However, you may have run across an example of a transitionary portable using both miniature and subminiature tubes. These are way cool...I have a Motorola "Pixie" my Mom got as an H.S. graduation gift. I don't know...there might even have been a model or two using subminis exclusively. Then...the subject of "hybrids" comes up...tube/transistor combos. A number of portables in the transitionary period of the late 50's were built this way. And, this was common technology for car radios before the advent of all-transistor units, along with car radios using 12V "space charge" tubes. No plate supply needed!
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