Info on old Tube Mic Amplifier F33aI B&K?

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mg73

Well-known member
Joined
Dec 9, 2005
Messages
176
Location
sweden
I got this old over engineered Microphone amplifier which I believe is some old test equipment
that went with the Neumann MM3(5) micorphone.

Got it working with a dynamic mic on the 10MΩ input but only measured the Condenser mic input
and one pin is ≈70v (HT?) but I believe should be 120v, lot of trimpots..

Anyway just checking to see if anyone have any info before I start to reverse engineer it😓
 

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