Power amplifiers mono — MasterSound Monoblock 300B

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

Key specs that matter

Input impedance is 50,000 ohms on both connections. Output power is a minimal 24W into 8 ohms - a classic single-ended-triode figure reflecting the celebrated 300B tube's characteristic power ceiling. Frequency response spans 8Hz to 45,000Hz within plus-or-minus 3dB. At 460 x 400 x 240mm and 25kg, the Monoblock 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 24W output requiring high-efficiency loudspeakers.

Pairing

As a monoblock, two units are needed for a stereo pair, and the minimal 24W output pairs best with notably efficient loudspeakers.

Alternatives

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