Catalogue
652 of 655 records previous / next
Marconiphone Crystal Junior Receiver Type RB2, by Marconi Company, Chelmsford, 1922
Inventory Number: 99532
Number of documents: 3
Document Type: Miscellaneous Note
Document Heading: Inscription
Text:
"MARCONI CRYSTAL JUNIOR / TYPE R.B.2. A.D.40519 / INST. NO P/B. 2379" printed on celluloid plaque on ebonite surface. "G Marconi [Signature Logo]" transfer on exterior surface of case front. "WAVE LENGTH / 300-450M / A.D. 40526" printed on celluloid plaque upon vertical surface of range block.
Document Type: Miscellaneous Note
Document Heading: Technical Details
Text:
Under normal conditions of reception, and with a good aerial, the Marconiphone Crystal Junior receiver was designed to give clear reception on headphones within a range of 15 miles from a broadcasting station.
Document Type: Miscellaneous Note
Document Heading: Manufacturer Details
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 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.
652 of 655 records previous / next
Record mode: Basic | Medium Images | Large Images | Documents (3)