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NOS SIEMENS EC92 6AB4 for NEUMANN UM57 UM92
NOS SIEMENS EC92 6AB4 for NEUMANN UM57 UM92
 
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Product Code: SH_EC92BWB
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Description
 
CERTIFIED ULTRA-LOW-NOISE SPECIMEN NOS TUBE MUSEUM QUALITY SIEMENS EC92/6AB4 The 'Neumann' UM-57 is really a Gefell (East German) mic with a large M7 capsule and 3 patterns, selectable at the power supply. It was introduced in 1957, and was the first variable pattern mic to be introduced by Gefell. In many ways its appearance is similar to the UM 92 by Microtech Geffel. It is similar in concept to the M49 and C12A, in that the one diaphragm is connected to earth, the back-plate is connected to the input of the tube, and is at 60volt, and the second diaphragm is varied from 0 - 120volts from the power supply to give you the various patterns. Make sure you have the power supply as the pattern switching is on it, and not on the mic. It uses an Siemens Halske EC92 triode for the tube.

***** Some tubes may not have the BWB insignia, Please Ask! Subject to availability.*****

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