Aclam Guitars

Aclam Windmiller Preamp

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Nail Pete Townshend’s legendary tone!

The Windmiller Preamp is a faithful recreation of the Grampian Reverberation Type Unit 636 built-in preamp.

This rare unit was used by The Who’s Pete Townshend between ’66 and ’67 to fatten his legendary tone and saturate his amps.

The Windmiller is a versatile pedal that can be used as an always on preamp, a booster for solos, or as a tool to saturate your amp.

Original Grampian units are known for their amazing tone when paired with Marshall stacks and single coils.

However, the Aclam team decided to create a device that could impart a similar character through any guitar and amp combination.

They achieved this by extending the Windmiller's frequency range and include EQ controls (all while retaining the original's unique tone).

Additionally, Aclam has eliminated the original’s ever-present “hiss,” crafting a quieter circuit with true bypass switching.

Plug into the Windmiller and attain Pete Townshend's timeless tone!

Aclam Windmiller Preamp features:

• Based on the preamp of the Grampian Reverberation Unit Type 636.

• Suitable for guitar, bass and keys.

• Improved and quieter circuit including true bypass switching.

• Hi. Cut and Lo. Cut tone shaping controls for maximum versatility.

• True Bypass.

• Power: 9V DC.

• Current Draw: 38mA.

• Dimensions: 5.4" x 3.4" x 2.2".



Type Preamp, Overdrive
Condition New
Power 9V DC
Current Draw 100mA
Power supply included No
Manufacturer Warranty 2 years
Shipping & Return


  • Free shipping within Canada.
  • Free shipping to the USA.
  • Free shipping on international orders over 399$.

    Visit the Shipping page for more infos.

Fast Delivery

  • Canada : 1 - 2 business days
  • USA : 1 - 2 business days
  • Rest of the world: 3 - 5 business days.

Hassle-Free Returns

You have 45 days to test your new gear.
If you choose to return it, we’ll send a full refund.
It’s that simple: no bogus restocking fees or charges.

Visit the Returns page for more infos.


Frequently Asked Questions

  • Q : Is this item in stock? +

    A : On product pages, you can find an availability status.

    Products with the mention 'In stock' are in stock and ready to ship.

    Products with the mention 'Out of stock' are not currently in stock.

    For out of stock products, you can ask to get notified as soon as the item is back in stock.

    Enter your email in the ‘Email me when available’ field and you’ll be kept in the loop.

  • Q : Where are you located? +

    A : We’re in Blainville, Quebec, Canada.

    Contact us to schedule an appointment if you’d like to meet.

  • Q : When will my order ship? +

    A : Orders placed before 2PM EST ship on the same business day.

    An update with tracking details will be sent shortly after purchase.

    (Please note: business days don’t include weekends and holidays)

  • Q : How much does shipping cost? +

    A : Shipping to Canada and the USA is free on most orders.

    Shipping to the rest of the world is free on orders over 399$US.

    Visit the Shipping page for more infos.

  • Q : What shipping method do you use? +

    A : We ship with UPS.

  • Q : What payment methods do you accept? +

    A : We accept credit cards and Paypal.

  • Q : Do you charge sales taxes to Canadians? +

    A : Canadian residents are asked to pay sales taxes:

    Alberta: 5%.

    British Columbia: 5%.

    Manitoba: 5%.

    New Brunswick: 15%.

    Newfoundland and Labrador: 15%.

    Northwest Territories: 5%.

    Nova Scotia: 15%.

    Nunavut: 5%.

    Ontario: 13%.

    Prince Edward Island: 15%.

    Quebec: 14.975%.

    Saskatchewan: 5%.

    Yukon: 5%.

  • Q : Are there import charges on orders shipped to Canada? +

    A : No. Canadian customers will not be charged import fees.

  • Q : Are there import charges on orders shipped to the USA? +

    A : No. USA residents will not be charged import fees.

  • Q : Are there import charges on International shipments? +

    A: Shipping prices do not include VAT or other import taxes.

    Customers outside of Canada and the USA are responsible for duties and taxes.

    Orders that come back to the shop as refused by the customer will be refunded minus shipping.

    Please track your shipment to be aware of customs processing and delivery attempts.

  • Q : Can you declare a lower value on customs documents? +

    A : We understand that import fees are an annoying part of international purchases.

    However, we cannot offer to declare a lower value on customs forms.

    Customers outside of Canada and the USA are responsible for any fees that may be charged by their government.