Sony 350
What little is documented about the Sony 350 comes almost entirely from period advertisements. It was a solid-state stereo tape deck, part of Sony’s push into the component hi-fi market in the mid‑1960s. The ads (which ran in Audio from 1966 through 1967) consistently describe a three-head design, two speeds, and the ability to monitor off the tape while recording — “binaural monitor,” as the tagline put it. Frequency response was given as 50–15,000 cps ±2 dB, signal-to-noise ratio at “better than 50 dB,” and flutter and wow under 0.15%. Dual VU meters and an automatic sentinel switch were included.
The deck came in a gold-and-black finish with a walnut-grained low-profile base. Sold as a component to connect to an existing stereo system, it could operate either vertically or horizontally. High Fidelity (April 1967, p.112) ran a full-page ad with the same bullet points, saying the 350 was built for "impeccable sound reproduction, flawlessly recorded - everytime." That is the extent of the record. There is no independent lab test, no user reviews and no production numbers. If a service manual or a detailed review exists, it hasn't turned up in the usual archives.
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