- Westminster Effects Zwingli SDD-3K Preamp; booster pedal, controls for Input, Output, Level, Soft Touch Relay Bypass, 6.3 mm mono in / output jacks, bypass switch, status LED, power supply via optional 9V DC adapter (409939), 2.1 mm x 5.5 mm barrel plug, polarity (-) center, battery operation not supported, current draw 64 mA, dimensions (L x W x H) 11.7 x 5.8 x 2.5 cm / 4.4" x 2.3" x 1", weight 227 g, handwired in South Carolina, USA
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