Try changing R-19 to something smaller. Might affect the sound, but if you don't like it, put the original R-19 back in and figure out how to get more drive from your preamp.
See http://users.ece.gatech.edu/~mleach/lowtim/fdbk.html for an explanaiton of the feedback scheme
See http://users.ece.gatech.edu/~mleach/lowtim/fdbk.html for an explanaiton of the feedback scheme
the amps were designed to have a bandwidth of 8mhz
I believe you meant a gain bandwidth product of 8MHz.
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