Mastersound Compact 845 Pure Single Ended Triode in Class “A”

Design

The Compact 845 is beautiful. Its stout pair of Psvane 845B HiFi Series power triodes is protected by a butterfly-like, laser-cut, anodized aluminum tube guard; its curved black-walnut side panels adorn a hefty, CNC-fabricated chassis made of antimagnetic stainless steel. The 75lb Compact 845 stands 10.8" high, 18.1" wide, and 16.3" deep, which stretches the "Compact" designation to its limit.

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Sound

The Mastersound Compact 845 hits all the sonic sweet spots: gorgeous, burnished tube tone, palpable instrumental texture, unerring naturalism, lush, rich, transparent midrange, solid bass, open treble, black background, precise layering of instruments and vocals—and the deepest, punchiest soundstage I've heard. It was also eerily quiet. Like the Audio Note Meishu Tonmeister integrated amplifier, I would be happy to live with this amplifier for the rest of my days. With the Compact 845, Mastersound moves to the front row in the hallowed hall of master tube-amplifier manufacturers, alongside Shindo, Audio Note, Air Tight, Line Magnetic, Luxman, and PrimaLuna.

Description

Tubed integrated amplifier with single-ended, class-A output stage and auto bias. Tube complement: two Psvane HiFi Series 845B, two JJ ECC802, two TungSol 6SN7GTB. Inputs: two pairs XLR (balanced), four pairs RCA (unbalanced). Outputs: two sets of speaker binding posts corresponding to 4 and 8 ohm transformer taps. Negative feedback: 0dB.Power output: 30Wpc into 8 or 4 ohms (14.8dBW, 11.8dBW). Frequency response: 8Hz–40kHz (±0dB). Output impedance: 4, 8 ohms. Input impedance: 50k ohms. Input sensitivity: 1.0V RMS for full output. Power consumption: 202W.