This article contains content that is written like an advertisement. (June 2015)
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.