Prima Donnas: 2x56 <2024>

Always use a soft-start circuit to protect those precious 1930s filaments.

The 56 is famous for creating a 3D "bubble" of sound. Prima Donnas: 2x56

The most coveted versions are "mesh plate" tubes, where the internal structure is a fine wire grid rather than a solid piece of metal. This is widely believed to provide a more detailed, airy soundstage. Why "Prima Donna"? Always use a soft-start circuit to protect those

Most "Prima Donna" builds avoid capacitors in the signal path, opting for high-quality interstage transformers to preserve the tube's natural harmonics. Listening Experience: What to Expect Prima Donnas: 2x56

For the DIY builders and the spec-heads, the 2x56 setup usually follows a specific architectural philosophy: 2.5 Volts (AC or DC). Amplification Factor (µ): Roughly 13.8. Plate Voltage: Typically run between 180V and 250V.