Modding the Bulldog Cabsim

[Rutger]

Hi,

I'm planning on building the Bulldog Cabinet Simulator, for some simple recording stuff.
Here's the schematic:


I would really like to vary the point of high frequency roll of, which is now around 4kHz. I would like to change it to something like 3kHz. But I'm not that good at electronics (yet), so I wonder if you could help me out a little.

I think this would have to do with the 6n8 cap, right? Should I just increase the value?
And should I calculate the value according to the figure 17.5 in this link?

http://wps.prenhall.com/chet_paynter_introduct_6/6/1665/426301.cw/index.html

Thanks!

[PRR]

C2 and C3. Multiply by factor 4/3. 300pFd and 9nFd.

[ayayay!]

Glad I saw this thread!  Great link there Rutger!  Also I've been looking around for the Bulldog schem for a little while.  I've heard some good feedback about it but never saw it proper.  Thanks! 

[Rutger]

Thanks a lot!

There's also a document somewhere with an explanation of the circuit and some additional mods. Ah, there it is:
http://www.google.nl/url?q=http://www.diyguitarist.com/DIYStompboxes/BulldogCabinetSimulator.doc&sa=U&ei=hGmyTqWPI4yXOqjL7fEB&ved=0CBgQFjAC&usg=AFQjCNE971IIFpF7FBOQGZ6T388F7RPqYQ

And another doc with a BOM and layout:
http://www.google.nl/url?q=http://codesafe.tistory.com/attachment/4975f211f068aA9.pdf&sa=U&ei=7WmyTpjtE4fsOdOIpOcB&ved=0CBEQFjAA&usg=AFQjCNHCTy22EXOjTMz4hbgTCSz24hcyvg

I would like to add a bass and treble switch to make it a little more versatile