What tone stack does this?

[MadAsAHatter]

I'm mainly referring to my Jaded Faith/EVO TM50, but am asking this in a general sense.

On the clean channel TMB and channel volume all set to noon I get a relatively clean tone. Leaving everything else the same, as I turn the treble down I get increasingly more saturation to the point of heavy crunch when at zero. Going in the opposite direction I get less saturation to the point of crystal cleans at max. Of course the high frequencies are reduced or increased respectively, but not to the point of being too muffled or too bright at the extremes.

I feel like this is similar to the way a Trainwreck works, but I'm not certain. So what kind of tone stack works in this fashion?

 

[SpiderWars]

The stack in a Vox/Matchless (and Trainwreck Rocket) can do that. Matchless called it ‘interactive’. I think it works that way because the Treble cap is a very small value at 47pF. A Marshall for example is 470pF.

In many/most of the guitar amp tone stacks, the Treble control is a divider between the ‘Treble cap’ and ‘everything else”. So in the Vox stack when you turn the Treble up you are increasing signal thru that tiny 47pF (not much signal here) but also decreasing the signal to ‘everything else’ (i.e. the bass and mid caps, which is most of the signal in these stacks).

When you turn the Treble down you doing the opposite. So that’s why gain actually increases when you turn the Treble down.

 

[MadAsAHatter]

That makes a lot of sense and lines up with what I'm experiencing when knob fiddling on the TM50. Sounds like its clean channel was based around a Vox/Matchless tone stack.