Catalogue
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Signal Receiver Type 57A, by Marconi Company, England, 1959
Inventory Number: 40275
Date: Dated 1959
Maker Details: Signed by Marconi Instruments Ltd.
Inscription: "R MARCONI INSTRUMENTS LTD. ..." painted on front vertical face. See Documents for other inscriptions.
Size: 660 x 320 x 220 mm (case)
Materials: Steel, plastic, bakelite, glass, assorted metals.
Notes:
Signal Receiver Type 57A, with black enamelled steel case with multiple controls and displays upon front vertical surface. Controls include multiple scale 360 degree frequency control with clear plastic multiple-scale reader, glass-fronted half-moon carrier/modulation display (scale 0-100), output voltage dual scale & dial (scales 20dB-0dB, 10-0), range scale & dial (assorted ranges in megacycles & kilocycles), incremental tuning dual scale & dial (scales -50,0,50 and other non-linear scale), percent modulation dual scale and dial (scale 75-0). All dials and knobs are polished black bakelite. With dials for multiplier (units volts), continous wave, set modulation, set carrier. With off/on supplies switch and external modulation control. With power cable plug terminal at rear.
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