Mic musings



I've recently been trying some mods to my Crate VC-508, and have found
that mic-amp interaction is a bigger deal than I thought.

I swapped the 12AU7 preamp tube out of the Crate and put in a 12AT7. 
The preamp section puts out a much hotter signal.  The sound is great,
but it's so hot that it produces howling feedback with most of my mics.

The exception is my Labtec AM-22 computer mic.  Apparently this mic's
output is way lower than any of the others in my collection.  It also
has much lower high end output.   (Some day soon I'll have record the
signal and analyze the frequencies on this mic.)  This mic plus the
12AT7 preamp tube gives me just what I want from the amp: a wide range
of tones, all with as much or as little tube distortion as I want.

But if I switch to a different mic, I've got to switch the preamp tube
to the 12AU7 as well.  Even my astatic JT-30 puts out more signal than
the 12AT7 can handle.

I wonder if it's a good idea in general to optimize the amp to the mic?

Also note: have recently swapped the stock speaker out for a Weber. 
That speaker rocks.

Thanks, Richard Hunter
http://www.hunterharp.com





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