The end of the Second World War brought new demand for harpsichords, and firms manufacturing the revival harpsichord prospered, notably Neupert, Wittmayer, and Sperrhake. The revival harpsichord continued to evolve, even into the period at which it was being abandoned. Kottick and Luckenberg describe a 1970 Wittmeyer instrument, kept today in a Berlin museum, that incorporated amplification: "In an effort to give this huge but relatively quiet instrument some of the resonance the antiques had, it was equipped with an amplifier, and two speakers were built into the soundboard."