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History of the manufacturer  

Radio Instruments Ltd (RI)., London

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Name: Radio Instruments Ltd (RI)., London    (GB)  
Abbreviation: radio-inst

R.I., Radio Instruments Ltd.,12 Hyde St.,London WC1; Moved into a new factory at 40 Purley Way, Croydon, in 1930. The factory and Company eventually closing in 1988. The Managing Director was Mr. Joseph Joseph. They made broadcast receivers for the general public. They also made radio equipment for the all the British Armed Forces, the Post Office and BBC. Radio sets were also exported to the then Soviet Union during 1932. (See newspaper cutting from The Croydon Times dated 30.4.1932)

My thanks to the Croydon Council, Local Studies Library, Katharine Street, Croydon, for the copy of the newspaper cutting.

Founded: 1922
Closed: 1988

This manufacturer was suggested by Konrad Birkner † 12.08.2014.

Some models:
Country Year Name 1st Tube Notes
GB  22 VIM   BBC/PMG stamp; GPO No.3001; 
GB  22 RI Model No.1 [GPO No. 122]   BBC/PMG stamp; GPO No.122; This set shares the same GPO No. 122 approval as the RI X.L.... 
GB  23 R.I. V3A [GPO No. 0476]   BBC/PMG stamp; GPO No.0476; 
GB  23 R.I. V2A [GPO No. 2100]   HF/DET; BBC/PMG stamp; GPO No.2100; 
GB  22 X.L.A. [GPO No. 122]   BBC/PMG stamp, GPO No.122; headphone compartment. This set shares the same GPO No. 122 ... 
GB  25 PM    
GB  23 No.2   Crystal Receiver, mahogany cabinet with lid.Black ebonite control panel.Brass fittings.... 
GB  99 doublet 76727    
GB  22 X.L.B. [GPO No. 112]   GPO No.0129 or 112; BBC stamp. 
GB  29 All-Electric Transportable Madrigal MH4    Anode-bend detection. Series connected battery valves are used. Rectificatio... 
GB  34 Ritz Airflo AC/TP  The same chassis is fitted to the Ritz, Duotone and Moderne models. 
GB  22–24 Receiver Type V.5.A [GPO No. 0482]   HF / DET / 3 AF Serial No. 172  GPO No. 0482 This set was tuned using a rotary wi... 


Further details for this manufacturer by the members (rmfiorg):

Closing year was obtained from Croydon Council. John Cartertbn_croydontimes30.4.32.jpg
Advertisement from the rear cover of the August 1st 1923 Wireless Weekly magazinetbn_gb_radioinstruments_wirelesswk.jpg
Thanks for Mr.Ozarai Pipo, Pocsaj, Hungary and Első Zalai Rádiómúzeum Alapítvány, First Zala County Radio Museum Foundation.tbn_gb_radioinst_rc6_25_26_reklam_1925.jpg
January 6, 1923 Modern Wireless magazine page ixtbn_gb_radio_instruments_jan._6_1923_modern_wireless_page_ix.jpg