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Re: James Tonestack Question

9/23/2004 8:59 PM
loudthud
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Re: James Tonestack Question
This is a long thread but I think I know what's going on. There is a way to make a midrange control that you can add on to the standard James bass and treble network. It looks like the bass control network except there is just one cap going end to end on the pot. Then another cap (10X the value of the first cap) connects the wiper of the pot to the output. I've tried it and it doesn't work as well as I'd like. You have to tradeoff gain for bandwidth so you can't get much +/- adjustment without affecting (interacting with) the bass and treble.  
 
Try to find a copy of the National Semiconductor "Audio Handbook" dated 1977. This is a very rare book that fetches big bucks on ebay. Or checkout the Marshall 2001 schematic dated 1981 in The Tube Amp Book by Pittman. These are Baxandall feedback designs but the same principals apply.