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Marconiphone Two-Valve Receiver Type 21, by Marconiphone Company, London, 1925
Inventory Number: 18847
Number of documents: 3
Document Type: Miscellaneous Note
Document Heading: Inscription - Inv. Num. 18847
Text:
"MARCONIPHONE / RECEIVER TYPE 21 / INST. NO P/R 3684 / APPROVED AND TESTED BY MARCONI'S WIRELESS TELEGRAPH CO. LTD. / AND LICENSED UNDER MARCONI PATENTS FOR THE RECEPTION / OF BROADCASTING IN GREAT BRITAIN AND IRELAND / MARCONIPHONE COMPANY LTD. LONDON" printed on metal plaque at rear of interior. "BRITISH MANUFACTURE ENTIRELY / BBC" logo transfer on reverse of lid. "G. Marconi" signature logo transfer on obverse of lid.
Document Type: Miscellaneous Note
Document Heading: Manufacturer Details - Marconiphone Company
Text:
After World War I, the Marconi Company began producing non-industrial receivers, principally for the amateur market, at the Soho premises of The Marconi Scientific Instrument Company. In 1922, the Marconi Company formed the 'Marconiphone' department, to design, manufacture and sell domestic receiving equipment. This equipment complied with Post Office specifications and tests, and was therefore awarded the BBC authorisation stamp; initially sets were made at the Chelmsford Works. In December 1923, the 'Marconiphone' department was formed as a subsidiary of the Marconi Company. Some Marconiphone Company sets were made at the Sterling Telephone Company (STC) Works at Dagenham. However, design and research of these domestic receivers still continued at Chelmsford. In 1929, the Marconiphone was sold to the Gramophone Company, along with the right to use the trademark 'Marconiphone' and the copyright signature 'G. Marconi' on domestic receivers. Hence, many domestic receivers were produced bearing the Marconiphone trademark, but the ones manufactured after 1929 had no connection with the Marconi Company.
Document Type: Miscellaneous Note
Document Heading: Technical Details
Text:
Under normal conditions of reception, and with a good aerial, the Marconiphone two-receiver'>valve receiver type 21 would operate a loud speaker at 50 miles range (and headphones up to 300 miles under favourable conditions). Wave-ranges were 300-500 metres and 1200-3200 metres by means of inter-changeable coils.
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