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History of the manufacturer  

Electro-Voice Inc.; USA

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Name: Electro-Voice Inc.; USA    (USA)  
Brand:
Buchanan
Abbreviation: electro-vo
Products: Model types Others
Summary:

Electro-Voice Inc., a division of Bosch; 12000 Portland Ave South, Burnsville, Minnesota 55337, USA. Also located in Lincoln, Nebraska, USA.  Previous factory locations in South Bend Indiana, Buchanan Michigan, Newport and Sevierville Tennessee, and Gananoque Ontario.

Founded: 1927
History:
From the site: http://www.electrovoice.com : The story of Electro-Voice is a classic American success story. Over the course of time, EV has grown into one of today's dominant forces in the design and manufacturing of leading-edge products for audio professionals. It is recognized the world over as a leader in audio technology.

From its humble beginnings, the company has evolved. Some of its "milestones" are:
1927 The company was founded by Al Kahn and Lou Burroughs in the basement of the Century Tire and Rubber Company in South Bend, Indiana as Radio Engineers.

1930 Kahn and Burroughs develop a public address system for Knute Rockne, the football coach at Notre Dame University. Rockne uses the system to address his team during drills on 4 adjacent fields. He calls the system his "Electric Voice."

1934 EV invents the hum-bucking coil, allowing microphones to be used close to lights and other electrical devices without hum. This design element is still used by nearly every company today.

1940 Electro-Voice introduces the noise-cancelling microphone to the military, which revolutionizes tank and aircraft communications. In the aftermath of World War II, the company is awarded a Congressional Citation for this important contribution to the war effort.

1954 EV introduces Variable-D microphone technology, a means of minimizing the up-close bass boost inherent in single-D directional microphones. Variable-D improves vocal intelligibility for live sound, recording and broadcast applications.

1957 EV invents the stereo magnetic phono cartridge.

1963 EV receives an Academy Award---the first ever for an audio product---from the Academy of Motion Picture Arts and Sciences for the development of the 642 Cardiline shotgun microphone. This product significantly advances the quality of sound on film.

1970 EV becomes the first company to widely adopt the philosophy of Australian physicists Thiele and Small and use vented low-frequency enclosures. Enclosures built using these criteria have deeper bass response and lower distortion than horn designs and higher sensitivity than sealed systems.

1974 Electro-Voice develops constant-directivity (CD) horns, which allow a loudspeaker to maintain its coverage angles over a wide frequency range with more uniform sound quality.

1986 EV revolutionizes concert sound reinforcement by introducing Manifold Technology. Manifold Technology allows the combining of the outputs of multiple drivers into a single horn or low-frequency enclosure without destructive interference. The result is a physical package that is a fraction of the size with much greater acoustic output capability.

1997 EV invents Ring-Mode Decoupling (RMDTM), a revolutionary approach to minimizing acoustical and mechanical resonances in loudspeakers. Speaker systems with RMD have improved clarity and resolution, especially in the vocal range.

2000 EV introduces VOBTM technology, an innovative mechanical design that significantly reduces proximity effect and improves vocal intelligibility in single-D microphones.

2000 EV introduces ClearScan wireless technology that enables automatic scanning and selection of UHF channels.


Some models:
Country Year Name 1st Tube Notes
USA  67 E-V Seven   Electro Voice 2 Way Speaker System Model E-V Seven. Frequency Response: 50 - 15000Hz ... 
USA  38 V-4   Velocity Microphone. 
USA  51 3010 6J6  "Tenna-Top" TV booster. 
USA  51 Tune-O-Matic TV Booster 3000 6J6  Electro-Voice Tune-O-Matic Television Booster 3000; US VHF TV bands, screw terminals. 
USA  56 3005   Tune-o-matic FM Booster. 
USA  56 3303 6BK7A  Electro-Voice model 3303 is an AC operated FM-AM tuner with preamplifier. 
USA  56 Lowboy Amplifier A20CL 12AX7  Integrated amplifier, mono, with several phono equalization settings; Wiggins Circ... 
USA  56 A-20 12AX7  AC Operated 20W Amplifier. Basic amplifier, "circlotron circuit". 
USA  56 A50 12AX7  Basic amolifier. 50-watt "circlotron circuit". 
USA  56 PC-1 12AX7  Control Center, remote preamp-equalizer. 
USA  57 PC-2 12AX7  Remote preamp-equalizer. 
USA  56 Patrician 4-Way Speaker System   Completed 4-way system that divides the audio spectrum between separate drivers. EV 18WK, ... 

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

tbn_usa_electrovoiceinc_1947_inserat.jpg
tbn_usa_electrovoice_logo.jpg
Werbung 1970tbn_usa_ev_michigan_ad_1970.jpg
tbn_usa_electrovoice_advertise_1952.jpg
tbn_usa_electrovoice_advertise_1948.jpg
tbn_usa_electrovoice_726.jpg
tbn_usa_electrovoice_advertise_1949.jpg
tbn_usa_electrovoice_advertise1953.jpg
tbn_usa_electrovoice_ad_1967.jpg
tbn_usa_electrovoice_advertise_1968.jpg
tbn_usa_electrovoice_mics_advertise_1968.jpg
tbn_usa_electrovoice_pl88l.jpg
Electro Voice logo from 1969tbn_us_electro_voice_logo_1969.jpg
Electro-Voice logo from 1966tbn_us_electro_voice_1966_logo.jpg

  
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