Prima Donnas: 2x56 -

The 56 is famous for creating a 3D "bubble" of sound.

Owning a piece of gear like this isn't "set it and forget it." To keep your Prima Donnas singing: Prima Donnas: 2x56

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 The 56 is famous for creating a 3D "bubble" of sound

String instruments like cellos and violins gain a woody, resonant texture that feels tactile. The Technical Specs String instruments like cellos and

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.

Older tubes drift. Check your voltages every few months to ensure they stay in the "sweet spot."