ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

 
Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  
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
email
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! :)  
Trace

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