R/E/P > Klaus Heyne's Mic Lab

U87Ai Sub-Board: How Bad Is It?

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FoxFoxFox:
Okay I see you do not like this circuit board  ;D (Sub board, also called "daughter board, as used in U87Ai with circuit # 04 and #05. K.H.) the mic sounds really full, fuller than I expected on the other hand! Anyway to get rid of that daughterboard and make it as stock as the ones without the daughterboard... ?

klaus:
In circuit revision #4 and #5, the 'daughter board' replaced the previous discrete FET circuitry on U87Ai circuits.
It can be removed, and missing passive components and a new 2N3819 FET can be installed. Once the FET is properly biased, you would be back to the simpler, better-sounding circuitries # 2 and #6.

FoxFoxFox:
Okay which one is mine then because I thought the daughter board was the floating tray, because mine is circuit 5, and it def has that "floating tray" on top of the regular board

klaus:
Yours has the daughter board.

FoxFoxFox:
Thanks Klaus!! I want to do the mod to get it back to #2 and #6, who do you recommend in NYC? also how much do you think this job typically cost

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