The Unitra WSH-805 integrated amplifier is a dual-mono stereo amplifier with switchable Class A and Class AB operation, inspired by the legendary 1970s Unitra WSH-205 model and built with modern low-distortion components. This Polish-engineered beast weighs 22 kg, contains 1586 discrete components, and strips away every trace of digital signal processing in pursuit of what Unitra calls the closest amplifier to original sound.
Key Takeaways
- Dual-mono design with separate preamplifier and power amplifier per channel for optimal channel separation exceeding 100 dB
- Total harmonic distortion of 0.0008% at 1 kHz ensures sound reproduction without tonal blemishes, matching artist intent
- Switchable Class A (8W at 8Ω) and Class AB (80W at 8Ω) modes let listeners choose warmth or headroom
- All-analog current feedback topology with proprietary discrete power block—no off-the-shelf integrated circuits
- Timeless 1970s aesthetic with swing-out VU meters, rocker switches, and patented automatic switching technology
Why This Unitra WSH-805 Matters Now
Analog amplifier design peaked in the 1970s and then stalled. Manufacturers pivoted to digital convenience, Class D efficiency, and software-driven tone shaping. The Unitra WSH-805 integrated amplifier refuses that compromise. It resurrects the WSH-205—a model so obscure that most Poles never heard of it because Unitra built it almost entirely for export—and rebuilds it with modern component tolerances and hand-matched transistors. The result is a statement: some listeners still believe that fewer components, no digital processing, and meticulous analog engineering sound better than anything modern convenience has produced.
Specifications That Back the Philosophy
Numbers alone do not make a great amplifier, but the Unitra WSH-805 integrated amplifier backs its design philosophy with measurable performance. Harmonic distortion runs to just 0.0008% at 1 kHz across 8 ohms at 40 watts—so low that intermodulation distortion of less than 0.0015% at 19–20 kHz becomes the limiting factor. Signal-to-noise ratio exceeds 102 dB, and channel separation tops 100 dB at 1 kHz, meaning each stereo channel operates in near-perfect isolation. Frequency response stretches from 6.3 Hz to 110 kHz, well beyond human hearing but a sign of the amplifier’s stability across the entire audio spectrum.
Class A mode delivers 8 watts per channel at 8 ohms—modest by modern standards but sufficient for efficient speakers in nearfield listening. Switch to Class AB and you get 80 watts at 8 ohms, or 125 watts into 4 ohms, enough to drive less efficient loudspeakers without compression. That flexibility matters. A listener with 90 dB speakers can run Class A all day; someone with 86 dB speakers has headroom in Class AB.
Design and Connectivity
The Unitra WSH-805 integrated amplifier does not hide its vintage inspiration. Swing-out VU meters dominate the front panel, flanked by rocker switches for Class A/AB selection and tone control modes. Bass, treble, and a smart contour control (which adjusts EQ based on listening level) sit alongside a linear bypass for purists who want no tone shaping at all. The balance control allows channel-level matching for off-axis listening.
Connectivity includes five RCA analog inputs—Aux 1, Aux 2, Tuner, CD, and Streamer—plus a dedicated phono input with separate ground for moving-magnet or moving-coil cartridges. XLR balanced inputs add professional-grade flexibility. Speaker terminals A, B, and AB let you run two speaker pairs or combine them, and a 6.3 mm headphone output with separate pre-out allows headphone listening or onward amplification. No digital input. No Wi-Fi. No app. Just analog signals flowing through discrete circuits.
Class A vs Class AB—What You Actually Hear
Class A operation biases the output transistors so they conduct continuously, eliminating crossover distortion but generating significant heat. The Unitra WSH-805 integrated amplifier limits Class A to 8 watts per channel—warm, immediate, and distortion-free for intimate listening sessions. Class AB kicks in when you need volume or are driving harder loads, trading some of that Class A purity for practical power. The toggle switch between modes lets you pick the character for your music and room, a choice that modern Class D amplifiers cannot offer.
How It Compares
Modern integrated amplifiers compete on convenience and power per dollar. They ship with Bluetooth, streaming chips, and digital tone controls. The Unitra WSH-805 integrated amplifier competes on analog purity—it is a direct descendant of the 1970s WSH-205, not a modern design dressed in retro clothes. Where a contemporary amplifier might use a digital-to-analog converter and digital signal processing to achieve low distortion, the WSH-805 achieves 0.0008% THD through discrete analog circuits and current feedback topology. That philosophy appeals to a specific listener: someone who owns vinyl, trusts analog sources, and believes digital convenience has a sonic cost.
Is the Unitra WSH-805 Worth the Investment?
Pricing sits around £4,500 to $5,000, depending on region. That is not entry-level, but it is not flagship money either—you are paying for engineering rigor and component count (1586 parts in a 22 kg chassis) rather than marketing hype. The amplifier comes in black or silver finishes and is available through specialist retailers like Audionation, Audio Influence, and Analogue Seduction. Warranty and support matter for a product at this price; confirm terms with your retailer.
Buy the Unitra WSH-805 integrated amplifier if you own efficient loudspeakers (88 dB or higher), listen primarily to analog sources (vinyl, tape), and believe that fewer components and zero digital processing yield better sound. Skip it if you stream exclusively, need Bluetooth, or want a one-box solution that handles everything. This is a specialist tool for a specific listener, not a universal amplifier.
What is the difference between Class A and Class AB on the Unitra WSH-805?
Class A runs both output transistors continuously, delivering 8 watts per channel at 8 ohms with zero crossover distortion but higher heat output. Class AB biases the transistors to conduct only when needed, delivering 80 watts at 8 ohms with slightly higher distortion but far more power for demanding loads. Toggle between them based on your speakers and listening preference.
Does the Unitra WSH-805 have a phono stage?
Yes. The Unitra WSH-805 integrated amplifier includes a dedicated phono input with separate ground for moving-magnet or moving-coil cartridges, making it a complete vinyl solution without needing an external preamp.
Can you use the Unitra WSH-805 as a preamp only?
Yes. The amplifier includes a pre-out, allowing you to use it as a control center and feed its output to an external power amplifier if you want to bypass the internal amp stage.
The Unitra WSH-805 integrated amplifier is not trying to be everything to everyone. It is a deliberate step backward to a time when amplifiers were simpler, more transparent, and built to last. If that philosophy matches your listening habits and you can afford the entry price, it delivers on its promise: sound that gets out of the way and lets the music speak.
Where to Buy
Edited by the All Things Geek team.
Source: What Hi-Fi?
