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Plessey 77 Mk IV Tape Recorder
Plessey 77 MkIV

During the early 1970's Plessey further developed the model 77 series. The 77 Mk IV was the first in the series to use a transistorised amplifier. Also there some minor changes such a tape spill edit function, Presage monitoring which is similar to the Sel-Sync function on Ampex machines, and colour coding of all controls. The date on the manual indicates that this model was available in 1973.