Hi again, I was asked by a friend re adding a active tone control to a pre amp curcuit
he is using the bellow schematic.
He was looking at a active tone control like this one.
6B4G wrote:Does the volume pot stay as is?
6B4G wrote:Also the 6SN7 is drawing about 11mA what would the 12ax7 be drawing?
A Tone Control You Can Love.
Figure 14 shows the tone control that I think has the best compromise between performance and tube count. Yes Virginia, everything is a compromise. It uses only two triodes per channel, one 12AX7 or your choice of other hi mu triodes, and it has a nice symmetrical looking frequency response curve. Its gain when set to flat is about -1 dB which is close enough to unity to not cause overload problems in a preamp or integrated amplifier. You could transplant the tube stages from Figure 18 below if inclined. The performance would be slightly improved.
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