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AmplifiersPower AmplifiersDiscontinued
Estimated price (community-sourced)
$956.35
Around — community and catalog average, updates slowly
About the SP-331MK
The SP-331MK is a two-channel hybrid stereo power amplifier combining a tube input stage with a transistor output stage. It delivers up to 150 W per channel into 8 ohms and 300 W per channel into 4 ohms, with the first 10 W per channel available in Class A. It has RCA inputs and two selectable pairs of speaker outputs (A and B).
Specifications
Type: Hybrid stereo power amplifier; Output power: 2 × 150 W RMS into 8 ohms, 2 × 300 W RMS into 4 ohms; Class A output: 2 × 10 W into 8 ohms; Frequency response: 10 Hz–50 kHz (±0.5 dB); Total harmonic distortion: <0.1% (1 kHz, 1 W); Input sensitivity: 1.5 V; Signal-to-noise ratio: >95 dB; Input impedance: 47 kΩ; Inputs: 2 × RCA; Speaker outputs: 4 pairs of terminals (A/B); Tubes: 2 × 6N16, 1 × 12AU7; Dimensions (W × H × D): 430 × 195 × 400 mm; Weight: 22 kg; Finishes: black or silver