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The Aclam Windmiller Preamp is a versatile pedal that can be used as an 'always on' preamp with a beautiful color, a booster for solo parts or a tool to saturate and enhance your amp's natural overdrive.



✔  Based on the preamp of the Grampian Reverberation Unit Type 636 S/N: 1138

✔  Suitable for guitar, bass and keyboards

✔  Improved and quieter circuit including true bypass switching

✔   Hi Cut and Lo Cut tone shaping controls for maximum versatility

✔  Aclam's proprietary Smart Track® fastening system



Aclam Windmiller Preamp Effect Pedal

SKU: AC-AP0030
£284.99 Regular Price
£227.99Sale Price
VAT Included
  • Dimensions 13.6 x 8.7 x 5.5 cm (5.4” x 3.4” x 2.2”) with knobs
    Weight 450 g (1 lb)
    Bypass Relay true bypass



    9V DC center negative 100mA minimum
    Current Draw ~38 mA
    Included 1 x anti-sliding rubber pad & 1 x Velcro® pad


  • Choose the best chain position for the Aclam Windmiller Preamp

    Due to its low input impedance, the location of this versatile preamp on the effects chain is crucial to get the desired functionality.  Here are some practical examples that will help you find the best setup for your Windmiller Preamp.

    Townshend Setup

    The Windmiller Preamp receives the signal directly from the guitar output jack.

    The result is the same as Townshend’s rig:  tone colouring; the gain knob turns up the amp’s preamp to increase saturation.

    Preamp with Tone Colouring

    You get the 636 tone colouring, but the signal boost can overload the pedals that follow before the amp.

    This can be interesting for getting new textures from overdrive pedals.

    Preamp with No Colouring

    The Windmiller Preamp pedal gets the signal from a buffered pedal to create a transparent preamp.  Use it to add gain to the overdrive pedals that follow but without the "colouring" to the tone.

    It will be a louder version of the bypassed signal.  Use the EQ controls to shape and fine-tune your tone.

    Transparent and Linear Boost

    The Windmiller at the end of the effects chain will act as a regular booster:  louder signal with the least tone colouration possible.

    If a buffer or effect circuit is placed before the Windmiller Preamp, isolating the pickups and, at the end, converting the signal to low impedance, then the Windmiller Preamp will react as a transparent booster without adding colour. 

    This set up is ideal for solo parts or to recover some signal lost in a long signal chain.  

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