Michael Brooks’ low-rise combo

To make his PP-18 combo as low as possible, Michael made it considerably deeper than the typical 9″/230mm of most typical Marshall-style combos. This allows the valves and transformers to clear the back of the speaker. Michael also added two small circular vents to allow air to circulate around the valves. Very kindly, Michael has sent over his cabinet plans for any builders who want to try the same approach (below).