Tone City Mad Stone TC-T37 Classic Germanium Diode Fuzz Guitar Effect Pedal with an Octave-Up


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Tone City TC-T37 Mad Stone Classic Germanium Diode Fuzz Guitar Effect Pedal with an Octave-Up

The Tone City TC-T37 Mad Stone is a classic germanium diode fuzz pedal with an Octave-Up function, high quality DIP component, and true bypass circuitry.

The Tone City Mad Stone is a dual-button, germanium-transistor fuzz pedal that offers classic yet versatile fuzz tones at an affordable price.

The Mad Stone uses germanium transistors, which provides a more vintage, rounded sound than their silicon transistor counterparts. Germanium-transistors fuzz pedals have a strong mid-range emphasis which gives them their recognisable warm sound and generally have a better dynamic response.

Warm fuzz tones are great, but if you want to go bigger and brighter with your sound then activate the octave up function. This adds a higher octave signal than not only gives your sound a doubled-up effect, it really helps it cut through the mix thanks to the higher octave tones. This pedal also has true bypass circuitry so it won’t effect your tone when you turn it off.


  • Germanium diode fuzz
  • Octave up fuction
  • High quality DIP component
  • True Bypass
  • Dimensions: 92 x 120 x 55 mm

True bypass
Input Impedance: 1Mohm
Output Impedance: 10Kohm
Nominal Input Level: -10dB Max
Output Level: 11dB
Bypass: True Bypass
Current Draw: 25mA
Power Supply DC 9V Regulated
Dimensions: 92mm x 120mm x 55mm
Weight: 500g

All Tone City pedals are True Bypass and require a 9v DC Center Minus Power Supply for operation as there’s no battery slot.  Tone City Pedals work best with a regulated power supply. You may experience unwanted noise with a non-regulated power supply.