Marshall jubilee tonestack

[RobBozic]

Hi guys,

Could someone explain how the jubilee tonestack works and sounds. Tonally, how is it different to the plexi tonestack? Can you scoop the mids etc..

Thanks
Rob

[HTH]

I've owned three Silver Jubilee amps over the years and yes, you can most definitely scoop the mids.

[RobBozic]

Thanks HTH,

By scooping the mids I meant can you get a Fender Blackface type response out of the amp where it's not so mid heavy like plexi's or JTM45's.

Thanks
Rob

[pdf64]

See Tonestacks: Fender vs. Marshall - Introduction
and other pages on that site for analysis.
Also there's Duncans tone stack calculator
TSC
a program you can download and play with values / settings etc.
Bear in mind that the tone stack is just one of several places where the frequency response is shaped, the speaker probably being the most significant.
Lowering the value of a coupling cap somewhere in the chain may be the simplest way of taking some of the weight out of the tone.
Pete.

[d95err]

See Tonestacks: Fender vs. Marshall - Introduction
and other pages on that site for analysis.
Also there's Duncans tone stack calculator
TSC
a program you can download and play with values / settings etc.
Bear in mind that the tone stack is just one of several places where the frequency response is shaped, the speaker probably being the most significant.
Lowering the value of a coupling cap somewhere in the chain may be the simplest way of taking some of the weight out of the tone.
Pete.

The Silver Jubilee tonestack is different from the typical Marshall tonestack, so I don't think Duncans Tone Stack calculator helps.

[jimboyogi]

Thanks HTH,

By scooping the mids I meant can you get a Fender Blackface type response out of the amp where it's not so mid heavy like plexi's or JTM45's.

Thanks
Rob

My opinion - no.
Even though you can cut the mids on the tonestack, you will not be able to get the same sort of response as a Blackface fender. This is (in my novice opinion) because in a B/F Fender the mid cut is before any appreciable distortion happens. In your Marshall the mid cut happens after the pre-amp distortion stage.

This difference has a big impact on the tonal effects of the mid cut as soon as you start pushing any overdrive, which is probably pretty early in the Marshall. So in the Fender you are not distorting the mids as much, in the Marshall you are cutting out the mids after the distortion harmonics have been generated.

I tried a mid cut control in both positions in a Marshallesque amp i am designing, and the difference was very real. Much more apparent clean headroom in the Fender style, much thicker and more assertive overdrive in the Marshall style.