MARSHALL STACKS WINDOWS

Output load of 1M (R5 at far right of the Duncan schematic above) to simulate the next R5 is not part of the tone stack, it represents the downstream load. You move the tone pot sliders and see how the frequency response graph changesīut you can also double-click any component in the schematic and change its value.įor example you can double-click on the tone slope resistor and see whatĬhanging its value does to the slope of the frequency response graph.

MARSHALL STACKS WINDOWS

Windows program that will help you understand how interactive the tone controls Fender used the mid scoop to compensateįor typical guitar pickups which over emphasize mid frequencies.ĭuncan Tone Stack Calculator program is a free, very cool and easy to use Duncan Tone Stack Calculator Graph of 5F6-A Tone StackĪll three tone controls are set to their mid point.

Tone caps also function as coupling caps to prevent high voltage DC from flowingĭownstream. Variable resistor while the Treble and Mid Pots are wired as potentiometers. Left and flows through all three tone caps. Guitar AC signal voltage enters the tone stack at upper Stack then examine the Treble, Bass and Mid filters separately in detail. The seemingly simple TMB tone circuit is surprisingly complexĭue to the interactive nature of its four audio filters and phase shiftĭescribe how it works in the most simple way possible. Occurs around an equal treble and bass volume mix so think of the treble controlĪs also being the 'shimmer control'. It is also similar to having aīuilt-in chorus pedal for mid frequencies. Playing mid and high frequencies and one playing mid and low frequencies but

It's kind of like having two guitars, one Phase differences which generates harmonic and intermodulation distortion andĬreates the 'Fender Shimmer'. The treble pot blends the treble and bass signals with their Treble cap so lower frequencies are phase shifted more than high frequencies. 1uF bassĬap that induces quite a bit of phase delay compared to the very small 250pF Shift.' The 5F6-A Bassman, blackface and silverface amps use a large. There is a slight delay as the cap fills and drains. When an audio signal flows through a capacitor Part of what makes a Fender amp a Fender amp is the phase shiftĬreated in the Fender tone stack. Works best when fed by a low impedance source such as aĬathode follower like in the 5F6-A, JTM45 and many otherĪmplifiers but it still works well when fed by a tube plate such as done in the It's a relatively low impedance circuit (high load) so it Pass audio filters that work together to work their magic. The TMB stack is made up of several low and high The TMB tone stack is passive, meaning it can only removeįrequencies, not boost them. Tone Stack Calculator program discussed below. To see how component valuesĪffect the tone stack's output you can use the Duncan Amps The stack's component values can vary in other amps. On this page I use the 5F6-A Bassman's tone stack but all The 5F6-A Bassman and AB763 Blackface TMB Tone Stack When Marshall copied the Fender 5F6-A BassmanĪlmost verbatim to create the JTM45 amplifier the Fender TMB tone stack came with itĪnd it's still being designed into new amps today. Has been around since the 1950's and has become a staple with Fender and

The FMV or TMB (Fender/Marshall/Vox Treble Mid Bass) tone stack

Marshall stacks