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Amplifiers currently produced in Seattle, WA since 1987.
Any Marshall founded THD Electronics in 1987. THD specializes in tube amplification and other products that have to deal with tube amps including the Hot Plate, which is a power attenuator that allows the player to use full distortion at a reduced volume, and a Yellow Jacket converter, which is a class A tube adaptor. THD released the BiValve 30 at the 2002 Summer NAMM show. They also make other amps, speaker cabinets, and tube converters. For more information visit THD's website or contact them directly.

From Blue Book Publications:

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