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Mastersound Compact 845 — a powerful, musical 845 single-ended amp
The Compact 845 pairs the beguiling warmth of an 845 triode with an unusually generous 30W-per-channel output, delivering both the lush midrange and palpable instrumental texture audiophiles crave. Reviewers at The Ear and Audiophilepure praise its expansive, precise staging, strong dynamics for an SET and a burnished, natural midband. Build is artisanal — heavy hand-wound output transformers, solid walnut end caps and substantial transformer cans betray premium in-house construction. Connectivity is straightforward (3x RCA, 1x XLR, Direct bypass, 4/8Ω taps) and a motorised volume plus RF remote make daily use simple. Ideal for listeners who want tube bloom without the tiny-watt compromises, the Compact 845 is a high-end, class-A SET that rewards careful speaker matching and quality cabling with immersive, emotionally engaging playback. Hand-wound output transformers and 30W SET power are standout differentiators.
Pros
- Lush, natural midrange and palpable instrumental texture that renders voices and horns with emotional weight and detail.
- Exceptional soundstage and imaging — wide, deep and precisely layered for convincing instrument placement.
- Unusually high SET output (≈30W) and strong dynamic punch for its topology, allowing use with more conventional speakers.
- Premium in-house build with hand-wound output transformers, robust chassis and refined finishes that support long-term reliability.
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Cons
- Output-impedance and the absence of negative feedback make speaker pairing important — some speakers can exhibit tonal shifts or high-frequency roll-off.
- Very heavy and thermally active (34 kg and significant heat from Class A operation), which can complicate placement and handling.
- Supplied RF remote and motorised volume are functional but basic; fine-level adjustments may feel brisk and the remote offers only essential controls.
Sound Quality
89/100
Dynamics
86/100
This is a Class A tube amp rated ~24W–30W per channel; expectations are modest for raw power but reviewers repeatedly note surprising punch and authority ("deepest, punchiest soundstage", "ballsy, dynamic punch"). Given Class A low-power norms, the amp's dynamic performance is excellent relative to its topology, though not limitless like high-power solid-state designs.
Soundstage Imaging
93/100
Both reviews highlight outstanding staging and imaging: precise layering, wide-open space and the "deepest" soundstage the reviewer had heard, with instruments rendered life-size and well-separated. The imaging is described as very focused and holographic, earning a very high score.
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Build Quality
92/100
The Ear documents in-house manufacture and hand-wound output transformers ("vital output transformers", "worked on by no more than three people"), heavy transformer cylinders and solid walnut end caps; chassis and transformer engineering speak to premium construction and excellent thermal/weight design.
Features Connectivity
84/100
Baseline feature set with useful extras: 3x RCA + 1 Direct, 1x balanced XLR line input, motorised volume and RF remote, Direct (preamp bypass) useful as HT/power-amp bypass, and selectable 4/8Ω speaker taps. No phono stage, no DAC, no digital/streaming inputs and no headphone output, yielding a modestly enhanced score above baseline.
Value for Money
89/100
Audiophilepure lists a price of $10,495 and both reviewers emphasize musical excellence, rarity of capability in the SET class (notably high output for a single-ended amp) and long-term satisfaction ("happy to live with this amplifier for the rest of my days"). The language supports a justified premium — expensive but defensible given performance and build.
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