Neumann CMV3

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The CMV3 was an important instrument for the propaganda of the National Socialists.
Hitler speaks in a Neumann CMV3 in Rosenheim in 1935.

The Neumann CMV3 or Telefunken ELA M 301/1 condenser microphone , also known colloquially as the Neumann bottle or Hitler bottle , was the first condenser microphone to be mass-produced . The microphone developed by Georg Neumann , built in 1928 and distributed worldwide by Georg Neumann & Co. in Berlin from 1930.

Development and technology

The abbreviation CMV stands for condenser microphone amplifier. Georg Neumann first produced two prototypes of the microphone until the third version was suitable and went into series production - hence CMV3. One was used electron tube of Telefunken called RE 084k . This required a heating voltage of 4  V and 100 V anode voltage. For the CMV3 there were capsules (membranes) with different directional characteristics. They were screwed on depending on the use. The apparatus weighed 1.6 kg, was 32.5 cm high and 9 cm in diameter.

Types

The microphone, which has been manufactured for over 15 years, is sometimes referred to as the Ur-Neumann and there were various modifications. The microphones were given at least one name from Neumann and one from Telefunken . Neumann signed a contract with Telefunken for worldwide sales. All Neumann microphones for export bore the Telefunken logo and a Telefunken serial number. This only changed in the late 1950s when Neumann set up its own US distribution.

The company BLUE Microphones from the USA builds a retro microphone with the type designation CMV3A, which is based on the CMV3.

commitment

The CMV3 was used at almost all major speeches by National Socialist ministers and politicians . At the Olympic Games in Berlin in 1936 , the microphone passed its test in front of a large audience. After the start of the war, Neumann's microphones and thus his company were classified by the Nazis as important to the war effort. Georg Neumann & Co. KG received a bomb license and was able to move to Gefell in Thuringia. In the US, the microphone was also called Hitler bottle ("Hitler bottle").

The Neumann CMV3 was in use from its introduction in the 1930s to the 1950s.

Individual evidence

  1. ↑ Studer and Revox, viewed January 20, 2016 [1]
  2. ↑ Information from Jogis Röhrenbude, viewed January 20, 2016 [2]
  3. ↑ http://www.coutant.org/12mics/
  4. ↑ NPR: Couple's Custom Microphones Carry Colorful Past, viewed January 21, 2016 [3]