Neumann U77

[Randallizer]

Hi Chaps

I've just brought out our U77 for the first time in a long time as I've just bought a Canford Audio T12 mains power supply. Previously we were using a battery operated one, but that got a bit expensive so we retired the mic until we got the new PS.

Fast forward about 8 months and we've just tested the U77. Sadly, it has now lost all bottom end/ low mids, so sounds very harsh and tinny. We've tried operating it with batteries, a phantom-T12 adapter, changing leads etc, all to no avail.

Any of you knowledge chaps have a recommendation as to where to start fault finding?

 

[zebra50]

I would look at the electrolytic caps first, and then the FET if that doesn't yield results.

Drop me a line at xaudia.com if you need it.

Cheers
Stewart

 

[Randallizer]

awesome, cheers Stewart. Gonna start after lunch!

 

[zebra50]

Do you have the schematic? I have it somewhere….