top of page


The Seventh Son pedal is based on the preamp found in the vintage Gallien Krueger 250ML lunchbox amplifier from the late 1980s, made famous by Iron Maiden, Chuck Schuldiner (Death), David Gilmour (Pink Floyd), Alex Lifeson (Rush) and others. 


Seventh Son Demos

Seventh Son Demos

Seventh Son Demos
Search video...
Master Effects #SeventhSon #GallienKrueger #250ML Stock v Modern #ironmaiden #death #chuckschuldiner

Master Effects #SeventhSon #GallienKrueger #250ML Stock v Modern #ironmaiden #death #chuckschuldiner

Play Video

The pedal uses a standard boss-style 9V power supply. There is internal circuitry to generate a ±15V power supply, just like the original amplifiers used.

Controls include a 4-band active EQ with boost and cut capabilities (8.0 kHz, 2.0 kHz, 500 Hz, and 120 Hz) and Volume control.  There is also a Gain toggle switch that goes between a lower gain crunch and a more saturated higher gain setting. 

We offer two versions of this pedal:  the "Classic" version which is faithful to the original amplifier, and the "Modern" version which offers improved clarity and removes the muddiness from the tone stack.

NOTE:  Due to the circuit boards using SMD components, it is not possible for the end user convert from the Classic to the Modern versions.   Any attempt at converting a pedal will void the warranty.

Each pedal uses a professionally assembled PCB and is proudly assembled by hand in Calgary, Alberta, Canada.

Other features include:

  -  True bypass

  -  Professional high quality FR4 PCB

  -  Powdercoated enclosure

  -  UV Printed artwork

The end result is high quality pedals that sound amazing, are consistent from pedal-to-pedal.

Each pedal comes with a 1 year warranty on parts and labour. Note that the warranty does not cover damage due to using an improper power supply or other misuse. 

The price is $229US + shipping for the Classic and $249US + shipping for the Modern.

Shipping within Canada and the US is $20US.  Shipping to the UK, Western Europe, Australia, and Japan is approximately $60US.  For other regions, please inquire for shipping rates.

For US customers, note that you do not have to pay any import duties or tariffs.

For customers outside of North America, please note that you will be responsible for any customs/import/VAT charges that your country levies on the pedal. 

Thank you and stay safe!

bottom of page