Integrated amplifiers — MasterSound Compact 845

The Compact 845 is a single-ended-triode integrated amplifier from MasterSound, sharing the Compact 300B's chassis platform with the more powerful 845 output tube. The Compact 845 brings MasterSound's most storied engineering heritage to a substantial single-ended-triode integrated chassis.

Key specs that matter

Two balanced XLR inputs and four single-ended inputs are provided. Input impedance is 50,000 ohms on both connections. Output power is 2 x 24W into 8 ohms - more than double the Compact 300B's 11W, reflecting the 845 tube's greater power ceiling. Frequency response spans 8Hz to 40,000Hz within plus-or-minus 3dB, matching. At 450 x 430 x 270mm and 34kg, the Compact 845 shares the Compact 300B's chassis dimensions with a modest weight increase.

Sound and use context

Expect the exceptionally rich, harmonically resonant character single-ended-triode amplification is broadly celebrated for among tube enthusiasts, with the considerably greater 24W-per-channel output providing more headroom than the Compact 300B.

Pairing

The modest 24W-per-channel output pairs best with notably efficient loudspeakers to achieve satisfying dynamic headroom.

Alternatives

MasterSound's own Compact 300B offers a more minimal-power alternative within the same broader single-ended-triode catalogue.