Sheep magazine Archive 2: issues 10-17


Lefty online magazine: issue 10, May 2016 to issue 17, November 2016

noise to enter the microphone on both sides of the diaphragm. The sound

striking the back of the diaphragm is 180 degrees out of phase with the sound

at the front. This causes a very impressive cancellation of the unwanted noise

whilst the speaker’s voice, which is less than a 1/4 of an inch from the front

opening, dominates the transmission.

In terms of manufacturing costs it would be hard to produce a cheaper

microphone. A carbon button is a very small tin of glorified coal dust

(carbon granules) with a simple diaphragm attached. A bit of wire and

some lightweight plastic fittings and that is it! Pure genius!


After some initial military skepticism the product was thoroughly tested

and a first order came through to Khan and Burrows for 100,000 units!

The T45 was soon taken up by all branches of America’s armed forces

and the success rate of combat communications rose to 90%.

Rags to RICHES

Prior to World War 2 Electro-Voice was a small struggling company,

with 20 employees, manufacturing a handful of dynamic and velocity

microphones per week. By the latter part of the war Electro-Voice had

500 employees working in 3 shifts producing more than 2,000 T45

microphones a day! After WW2 it was also adopted by commercial

aviation and remained in service for several decades. The T45 was also

used on the Mercury, Gemini and Skylab space missions.

Over the entire production run more than a million were produced placing

the T45 among the highest selling microphones ever made.

During the war many small firms went out of business due to a shortage

of manpower and materials, but for those involved in the war effort

fortunes were to be made. In 1946 Electro-Voice moved into an

impressive new factory at Buchanan Michigan where they continued to

manufacture innovative and exciting audio products for the next 60 years.


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