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Milbert Amplifiers is an American electronics manufacturer based in Gaithersburg, Maryland, which applies advanced power supplies and other patented technologies in its high-end audio equipment. Introduced in 1986, its mobile vacuum-tube audio amplifier has been followed by several models collectively in continuous production for nearly 30 years. Milbert also produces vacuum-tube guitar and musical amplifiers  using unique impedance conversion  which is claimed to prolong tube operating lifetimes.