Catalogue
594 of 655 records previous / next
Marconi Crystal Receiver A Type RB3, by Marconi Company, England, 1922
Inventory Number: 93260
Number of documents: 4
Document Type: Miscellaneous Note
Document Heading: Inscription
Text:
"G. Marconi [Signature logo]" transfer on front surface of lid. "BBC [LOGO]" on interior surface of lid. "MARCONI CRYSTAL A / TYPE R. B. 3. M. 2 / INST. NO S/C. 1368" printed on celluloid plaque upon ebonite surface of receiver. "WAVE LENGTH / 300 - 450 M. / C.P. 020" printed on celluloid plaque upon vertical surface of wavelength plate.
Document Type: Miscellaneous Note
Document Heading: Object Dating
Text:
This particular receiver can be accurately dated to between November 1922 and December 1923. The BBC logo ("TYPE APPROVED BY POSTMASTER GENERAL") was used from 1st November 1922 until September 1924, while this instrument is also signed by the Marconiphone Department of the Marconi Company (founded in 1922). In December 1923, a separate Marconiphone Company was founded.
Document Type: Miscellaneous Note
Document Heading: Technical Details
Text:
Under normal conditions of reception, and with a good aerial, the Marconiphone Crystal A reciever 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.
594 of 655 records previous / next
Record mode: Basic | Medium Images | Large Images | Documents (4)