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previous: Dan Lurie Trace,The Fat switch just adds ... -- 3/28/2004 7:47 PM View Thread

Re: Fat + More Gain

3/28/2004 8:57 PM
Trace - Voodoo Amps
Re: Fat + More Gain
~~~ Trace,  
The Fat switch just adds a big cathode bypass cap to the preamp cathode bias.  
I want to increase gain more than just add the big cap so I thought if I lower the cathode resistor at the same time as add the big cap I would get there. The problem is as I stated above is the BUMP noise I get when I change the Bias level.  
@@@ You can wire in a 1.5K cathode to give you more gain and then use the switch to drop the cap (22uF) in parallel with the resistor. Off the top of my head I don't you are going to get around the bumping sound by the way you are switching. You would have to go to a different method of switching (more involved). Check out some of the multi channel amp schematics as they have several different ways of switching.  
Good luck and have fun tweaking! :)  

Dan Lurie I am using jFet's to switch so I co... -- 3/29/2004 12:18 AM