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Author Topic: Converting Neumann KM 56a to KM 56aC?  (Read 2491 times)


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  • Real Full Name: Terrence Town
Converting Neumann KM 56a to KM 56aC?
« on: May 10, 2011, 11:17:28 AM »

I have a nice pair of these mics, but they were built before the 'c' biasing came into being.

I'm wondering how difficult it would be to do the conversion.  Also, I couldn't find a schematic online with step-by-step instructions for how to do this.  Does anyone (Klaus?) have this information?

Thanks in advance!

J.J. Blair

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Re: Converting Neumann KM 56a to KM 56aC?
« Reply #1 on: May 11, 2011, 12:01:19 AM »

Any competent mic tech can do it.  It's not that difficult.  If you can't find a schematic, look at some M49 and M49c schematics to see how the self biasing cathode is implemented.
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