The Catalinbread Effect Pedals - Formula 5F6 is a perfect solution for any player looking for the classic 1950s sound coming from tweed Bassman-style amplifiers. Using two 6L6 output tubes with a 4X10" speaker configuration, these prized amps are hard to find, and need to be cranked LOUD in order to achieve classic distortion tones. Here we have the tone nailed in a stomp box form; even down to the three-band EQ!