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
Is the Leach amp capable of 40 V rms out (with the PS you have got)?
The amp has gain of 21, a rather normal value. Don't have too much gain beacuse you only get more noise.
The gain is set by (R17+R18)/R19 + 1
The amp has gain of 21, a rather normal value. Don't have too much gain beacuse you only get more noise.
The gain is set by (R17+R18)/R19 + 1
Changing feedback values
Changing R19 is best done with a scope and a variac or a light bulb. It takes less than a second to blow output transistors once the amp burst into hf oscillation. Cheers.
Changing R19 is best done with a scope and a variac or a light bulb. It takes less than a second to blow output transistors once the amp burst into hf oscillation. Cheers.
if i am not mistaken, increasing the voltage gain to get better sensitivity have an impact on bandwidth, the amps were designed to have a bandwidth of 8mhz, this is fixed so that increasing the voltage gain, decreases the closed loop bandwidth...
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