Carl Martin / Big John / Guitar For Sale
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Have you ever thought whether pedals that can be powered by 9v batteries were designed to sound the same regardless of how low the voltage drops in the battery? Or how about that jice hot ‘wall-wort’ transformer you are using? Obviously, all pedals are designed and manufactured for ideal power situations, and therefore do not sound the same or as good when your power fluctuates or drops. Why not treat your pedals to pure, regulated 9v DC power for the whole show, or as long as you need? The Big John Power Supply can do just that … seven outlets of regulated 9v DC power to keep your pedals performing just the way they were designed. Shipped with seven power cables, a sturdy steel housing and LED indicators for functions, the Big John Power Supply is just what the doctor ordered for your ailing power situation.
Carl Martin, Denmark 
Carl Martin Company Profile
ESR was founded in 1990 as a professional PA sound rental company. Shortly after we began producing custom made audio equipment.
Our goal was from the very beginning to develop and produce products for the demanding professional musician, with a superior sound quality and features not seen on any other guitar effect pedal. As a result of that our first guitar effect pedal, The Hot Drive'n Boost, was introduced in 1993.
Due to our extensive knowledge of the professional music industry, and our contacts with a wide range of demanding musicians, we have been able to maintain a high quality of products and now have a range of 28 high quality guitar effect pedals, with more to come in the future.
In 2005 we released our first point point handmade tube amplifier the Custom Shop 50, the line now includes heads,- caps as well as a bass system.
Søren Jongberg
CEO East Sound Research
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