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History of the manufacturer  

EMI; Hayes, Middlesex

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Name: EMI; Hayes, Middlesex    (GB)  
Abbreviation: emi
Products: Model types Tube manufacturer

EMI Electronics Ltd Broadcast & Recording Equipment Divison; Hayes, Middlesex, England (UK) - also called: EMI Electric+Musical Industries Ltd. [Info Herbert Odermatt].

EMI made many special purpose tubes: high resolution TV camera tubes and CRT, photomultipliers, klystrons, magnetrons and traveling wave tubes.
Electron Tube Division was also present in U.S. with manufacturing facilities in North Hollywood, CA.

Also: E.M.I Sales & Service Ltd., Hayes, Middx., England.

Some models:
Country Year Name 1st Tube Notes
GB  90 Photo Multiplier Tube Housing E-258 9558B  Tube Housing for Gamma Ray Spectrometer matched with EMI model 1113F Tube Base; Two ... 
GB  99 Dublette zu ID= 207086   Frequency range 50 Hz to 10 kHz. Uses plastic tape running at 7 1/2 in/sec, and giv... 
GB  57 Miniature Measuring Oscilloscope WM4   Incorporates a multi-range AC/DC voltmeter which gives a direct measurement (independen... 
GB  55 Amplifier STD 373/DLS EF86  Mono power amplifier. 
GB  45 Automatic Monitor L63  3 channel audio preamp unit. 
GB  50 Emidicta unknown   Emi Emidicta (unknown type); Dictation machine, crank shift operated turntable, opera... 
GB  55 TR51B Z729  The TR51B is transportable full-track 1/4" reel-to-reel recorder working on two sp... 
GB  56 Oscilloscope 2300   EMI 2300; 2,25 " round CRT oscilloscope, 3 MHz Y amp., 7 Hz - 50 kHz time base, mad... 
GB  52 Emicorda - Emicorder 2301 H Z77  Vitesse 19 cm/s, 1 moteur, diamètre des bobines 18cm. Frequency range: 50 Hz to ... 
GB  64 Elite I EP10 EF89  Record reproducer manufactured by E.M.I. Sound Products Ltd. Fitted with BSR UA16 record u... 
GB  64 Elite II EP20 UCL82  Record reproducer manufactured by E.M.I. Sound Products Ltd. Fitted with Garrard Autoslim ... 
GB  64 Lounge Table Gram EST50 UF89  Stereo record reproducer.