[Note added July 2013: This is an early example of a channel breakout modification. While this example is quite useful, since I posted this in 2005, I have refined this type of modification both in concept and in technical execution. (For example, this modified MXM lacks mute switches and has unbalanced outputs.) Please see my channel breakout hub page.]
By adding solid-state direct output buffers to a Bogen MXM preamp/mixer, I made five independent tube mic preamps available on this old unit (among other modifications). Here's how I did it:
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Channel Breakout Modification Hub
Altec 1567A Extensive Modification Including Channel Breakout
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