Prima Donnas: 2x56 | Deluxe & Recent

Much like a difficult opera singer, the 56 tube requires a perfect environment to perform. But when the bias is right and the shielding is perfect, the vocal reproduction is unparalleled. The Technical Specs

These tubes are notoriously "microphonic." If you tap the chassis of the amplifier—or even walk too heavily across a hardwood floor—you might hear a "ping" through your speakers. Prima Donnas: 2x56

Always use a soft-start circuit to protect those precious 1930s filaments. Much like a difficult opera singer, the 56