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Like this one, which I’ve been meaning to explore for ages: the Fender TBX tone control circuit, which appears in several Custom Shop instruments, notably the Clapton signature Strats. Like the G&L PTB circuit I’m so apeshit about, it’s a 2-band passive tone control — but one that sounds very different.How can I increase the bass cut on my TBX?
Replacing the TBX's stock resistor with a second capacitor will give you greater control over the amount of bass cut in the circuit. Swap a 220 kΩ resistor for the TBX's stock 82 kΩ shunt resistor for smoother operation in passive setups.Is the TBX shunt resistor a tone resistor?
The TBX control was originally tone. But an 82 kΩ shunt resistor is something passive circuitry. After the Clapton signature there untouched—heaven knows why.What is the difference between a PTB and a TBX?
The PTB is a two-knob circuit that lets you siphon off highs, lows, or both. I’m agog at how well it works with humbuckers — you can get so many cool sounds by rolling off lows on the way to a fuzz, as heard here. But TBX (it stand for “treble bass expander”) is a one-knob circuit, tbough that single knob rotates two stacked pots.