But anyways, there’s tons of different combinations of pots and caps you can use, and they all interact a bit if you futz with it in Duncan’s calculator.

Here’s a graph:

cool colors are the Marshall tone stack, hot colors are the Muff’n tone stack.

The curves with less treble have every potentiometer set half-way. The curves with more treble have every potentiometer set half-way except for treble, which is cranked.

I can see why they designed it like this. They improved the bass response, which is generally something want more of nowadays, and they cut the mids more, perhaps to make it a bit more Muffy.

I think to tame the treble the best thing would be to change the pot to reverse-log 250k, and change the mid pot to 25k linear. This will also as a byproduct make it less scooped.

What I’d also do (and this is just me) is add a “bright” switch to add a 250n or so cap in parallel to the 220n cap to bring it to the typical Marshall spec and had some high-mids as well.

I’d tone down the EH .1u to the Marshall 22n and have a switch to add a 78n or so cap in parallel as a “bass boost” switch.

Increasing the mids cap increases the mid-scoop, but also lowers the center frequency of the mid scoop and lowers bass. So you could find a cap value you like as far as mids go, and then add a mid scoop switch that would wire another cap in parallel too.

If you wanted to, you could also add a tone-bypass switch.

You know, I’m not sure. . . I’m still learning about this stuff myself.

One thing you have to consider is that people all have different guitars, different amps, and different cabs.

Your setup may be relatively bright and you might not need so much of the treble. Someone else might have a very dark amp/cab/guitar combo and need more.

Or sometimes people like to run effects chains in parallel and blend. Sometimes a lot of treble is beneficial. You can get some really great dirt tones with heavy treble in one parallel chain, and a really thick bassy distortion in the other.

Hey, I’m back.

Check this out:

http://www.duncanamps.com/tsc/

This program is a tonestack calculator. It takes popular tone stacks and calculates the EQ curve for them.

The English Muff’n indeed uses a Marshall Tone Stack, but the values are tweaked.

Here’s the Marshall Tone Stack:

(note, treble pot is linear, bass pot is audio (reverse logarithmic), and mid pot is linear.

Now here are the values for the English Muff’n (according to the schematics I found):
R1: 30.1 k
R2: 250k linear
R3: 500k log
R4: 10k log
R5: omitted
C1: 220p
C2: .1 u
c3: 22n (unchanged)

Of course, remember that the intensity of the treble will also relate to your mids and bass settings.

Replacing that 220pf cap with a 470 pf cap might just do it.

Well if only part of the range of the pot is useful to you, then you could replace the pot with a different value.

Looking at a schem, I see it’s a 250k linear. I think you want to change potentiometer type to either logarithmic or reverse logarithmic. Changing the value might help as well.

I just googled the schematic and took a peak at it.

You could also mod the tone stack as a whole to be an exact copy of the Marshall tone stack (it’s very similar, but slightly different, if the schematics I’m looking at are correct.) I have to go right now, but I can describe the differences in a little bit.