Integrated amplifiers — MasterSound Compact 300B

The Compact 300B is a distinctive single-ended-triode integrated amplifier from MasterSound, built around the celebrated 300B output tube with a minimal power output. The Compact 300B brings MasterSound's most storied engineering heritage to a substantial single-ended-triode integrated chassis.

Key specs that matter

Four balanced inputs are provided. Input impedance is 50,000 ohms on both connections. Output power is a minimal 2 x 11W into 8 ohms - a classic single-ended-triode figure reflecting the celebrated 300B tube's characteristic power ceiling. Frequency response spans 8Hz to 40,000Hz within plus-or-minus 3dB. At 450 x 430 x 270mm and 33kg, the Compact 300B's considerable weight for its minimal power output reflects serious internal transformer engineering consistent with quality single-ended-triode design.

Sound and use context

Expect the exceptionally rich, harmonically resonant character single-ended-triode 300B amplification is broadly celebrated for among tube enthusiasts, with the minimal 11W-per-channel output requiring high-efficiency loudspeakers.

Pairing

The minimal 11W-per-channel output requires high-efficiency loudspeakers, typically horn-loaded or high-sensitivity designs exceeding 95dB.

Alternatives

MasterSound's own Compact 845 offers a related single-ended-triode alternative built around the more powerful 845 tube within the same broader catalogue.