This is not as straightforward as you might think. Unfortunately, simply changing the feedback resistor can cause instability at lower gains. To maintain stability over a wide range of gains you need to also change the open loop gain as you change the closed loop gain. In other words, the REDD47 is not designed to work over a wide range of gains.I am currently building a redd 47 preamp and I wonder what resistance added for a variable gain as in the EMI model! be 22,28,34,40,46,52 db 6 step.
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