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Pardon the slow update- right as we got these mystery Bruel & Kjaer pre's in working order we also opted to reconfigure our space for a Rupert Neve Designs 5059 summing mixer. :) This past week has been a gauntlet of soldering work to convert our Mogami snakes to the required connections on either e...

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Scodiddly, forgive my n00bness, but please explain? I'm no electrical engineer.

~D

First of all, thanks so much to everyone here who offered advice and helped me get on the right track! This thing is modded and passing signal now. :) After bouncing email with Bruel & Kjaer, they confirmed that this was built in their old Ohio division. Sometime in the late 70's or early 80's (Thei...

Test metered the amphenols with the unit powered up. Very, very similar to the LEMO pinout except I think the pin 4/5 duties are different. Definitely glad I metered it as I'm seeing 120v on one of the pins! Not going to hook that one up to any of my mics, needless to say. lol. Im going to make some...

Thanks Drone, I just looked at that catalog PDF and the first thing that caught me was the logo. The B&K badge on the back of the unit I have is identical.

Thanks Nick! I had suspected aeronautical use when I saw the Pratt & Whitney tag but didn't know enough to be certain.

I'll post results here, if I get any.

~Dorian

It might even just be some weird old piece of test equipment, but I'll be darned if it doesn't seem like a set of preamps.

http://s32.postimg.org/x34qpybup/IMG_9230.jpg one of the pre's http://s32.postimg.org/5ttdbgarl/IMG_9231.jpg Pratt & Whitney inventory tag http://s32.postimg.org/6304sv2bl/IMG_9232.jpg power supply on lunchbox http://s32.postimg.org/h557rawe9/IMG_9233.jpg more pre's http://s32.postimg.org/ro57ggz29...

Hi all! I have come across a lunchbox rack of 6 interesting old mic pre's with no markings or brand other than "SQ-305-1 Microphone Amplifier" on each module, and "B&K Instruments, Inc, Cleveland Ohio" on the power supply. There are also a few metal inventory tags from Pratt & Whitney (airspace comp...