The Tremster´s strength lies in the way the effect is modulated. In simple terms, it means that the waveform used to turn the volume up and down (creating the tremolo effect) is a bit special. Instead of a sinus wave or a triangular wave, the Tremster´s waveform is quite soft around the peaks, but otherwise relatively abrupt. This creates a very nonobtrusive effect, that melts in with your playing – even at maximum depth.  It´s like it just breathes in a calm way, instead of sounding like your playing is hyperventilating, so you can use MORE tremolo without losing anything, much like tube tremolos on older amps.

Add to that a pulsating led for visual indication of the speed, true bypass and a mode switch for less/more throb and you have a really nice and simple box that does what it should do, does it in a very musical way and with no hassle. It´s three knobs, all analog stuff, but the sound is what you pay for.

Truthfully, we are bringing back the Tremster due to years of comments on its sound “Hey, can I still get the old red one from you? I miss it ”. Well, yes you can.


  • “The red one” - Natural, organic tremolo effect

  • Hand-built in Denmark

  • True bypass

  • Reproduction of the original Tremster circuit

  • Selected parts match or surpass the old ones in quality/sound

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Input impedance @ 1KHz Higher than 1M Ohm
Output impedance @ 1KHz Lower than 1K Ohm
Power supply 9V DC (T-Rex FuelTank)
Minimum power supply voltage 8V DC
Maximum power supply voltage 12,5V DC
Current draw @ 9V DC 7 mA
Maximum input signal V p-p 1,7V p-p
Battery type 9V battery 6F22
Battery life 12-16 hours
External connectors input jack, output jack, 9V DC jack
Controls On/off, volume, speed, depth, mode
Pedal size incl. knobs (W x H x D) 100 x 55 x 120 mm / 3,9 x 2,2 x 4,7 inch
Weight excl. packaging 0,450 kg / 15,9 oz


User Manual: pdf

Photos:  hi-res / low-res

Info Sheet: pdf


Depth: Adjusts the depth of the volume modulation

Speed: Adjusts how fast the tremolo pulsates

Level: Adjusts the output level

Mode switch: Switches between hard/soft tremolo