kdawg
Well-known member
Hello - I am new to tone stack design, but I'm trying to change a tone stack circuit that uses a 12AU7. I successfully tried the new circuit, and tonally it's OK (I wanted to use 1 Meg pots instead of 200K, but I don't have any right now)... but I've lost a lot of gain compared to the original circuit - I'm assuming because it was from a cathode based tone stack, yet my original was anode based. I'm not sure about what voltages I should be having and/or if I need to add something else to match this tone stack. There is 50 volts at the anode into the tone stack, no DC at stack output.
I did try reducing the 220 K resistor and that did get some gain back. Would someone be willing to help me out? Thanks!
Before:
http://picasaweb.google.com/funkymusic/Schematics?authkey=Gv1sRgCP79leLqr-XhfQ&feat=directlink#5309970237323243522
After:
http://picasaweb.google.com/funkymusic/Schematics?authkey=Gv1sRgCP79leLqr-XhfQ&feat=directlink#5309970250318146722
-kdawg
I did try reducing the 220 K resistor and that did get some gain back. Would someone be willing to help me out? Thanks!
Before:
http://picasaweb.google.com/funkymusic/Schematics?authkey=Gv1sRgCP79leLqr-XhfQ&feat=directlink#5309970237323243522
After:
http://picasaweb.google.com/funkymusic/Schematics?authkey=Gv1sRgCP79leLqr-XhfQ&feat=directlink#5309970250318146722
-kdawg