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[ttown]

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]

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.