Atom Heart Studio 

Siemens V 79
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The Siemens V 79 is an ampli 2 channels with mixer. It's one of a first portable 2 way mixer created, in fact it has been made in 1956. It's powered by batteries "Radio" 67,5 Volt.
Channel 1 is for dynamic microphone and channel 2 is for dynamic and condensator mic.

Link: https://www.radiomuseum.org/r/siemens_v79_kl_v_079a.html

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