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Supro Analog Harmonic Tremolo Pedal



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Supro Analog Harmonic Tremolo Pedal

The Supro Tremolo's AMPLITUDE / HARMONIC switch allows the musician to choose between these distinctly different, vintage effects. AMPLITUDE mode provides the traditional swampy tremolo sounds generated by bias-modulating the power tubes in the original Supro amps.

HARMONIC mode provides the psychedelic tones of Leo Fender's brownface and blonde amps from the early 60s. Supro implemented Leo's unique harmonic tremolo effect within this pedals transformer-equipped output stage to create an amp-like modulation experience. The Supro Tremolo pedal features preamp and power amp sections, with an actual output transformer deployed to recreate the magnetic saturation and coloration of the original vacuum-tube-based effects found in these historic amps.

Along with the standard modulation controls for speed and depth, the Supro Tremolo also features a gain circuit that allows the musician to overdrive the output stage, right where the modulation effects are created. The GAIN control sets the amount of "preamp" gain in the pedal. As you turn the gain up, the "power amp" circuit will gradually be pushed into overdrive. This control gives you a wide range of sounds from clean to grind, with magnetic saturation occurring as the power section is pushed into overdrive.

As you crank up the gain, the overall output level of the Supro Tremolo is automatically compensated in order to maintain consistent signal level. This allows the musician to use the GAIN control to alter the texture of the modulation effects without an overwhelming increase in audio output level.


  • Switchable AMPLITUDE or HARMONIC modes Emulates a Class-A tube amp circuit from end to end Achieves magnetic saturation via output transformer Gain control with auto level compensation 
  • Expression pedal control for SPEED 
  • Accepts standard 2.1 mm neg. tip power supply 
  • Runs on 9V battery (included) 
  • Current draw under 30mA 
  • Pedal size: 12 cm x 6.5 cm x 6.5 cm 
  • Original circuit design by Thomas Elliott

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