The Altec M11 Microphone System featuring the Altec 21B miniature condenser microphone
The Altec 21B miniature condenser microphone on the Altec 150A base.
![Altec 21B](https://coutant.org/altec21b/01.gif)
![Altec 21B](https://coutant.org/altec21b/02.gif)
![Altec 21B](https://coutant.org/altec21b/03.gif)
![Altec 21B](https://coutant.org/altec21b/04.gif)
![Altec 21B](https://coutant.org/altec21b/05.gif)
![Altec 21B](https://coutant.org/altec21b/06.gif)
![Altec 21B](https://coutant.org/altec21b/07.gif)
![The P518A power supply](https://coutant.org/altec21b/box.jpg) The Altec P518A power supply.
![Altec 21B](https://coutant.org/altec21b/08.gif) View this schematic (OPTION-CLICK or ALT-CLICK or right click the link to download this schematic)
![Altec 21B](https://coutant.org/altec21b/09.gif)
![Altec 21B](https://coutant.org/altec21b/10.gif)
![Altec 21B](https://coutant.org/altec21b/12.gif)
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