BRZHIFI A1s A1 Series 20W×2 at 8Ω Class-A Amplifier HiFi Power Amp (Silver) for Audiophile Home Use

BRZHIFI A1s A1 Series 20W×2 at 8Ω Class-A Amplifier HiFi Power Amp (Silver) for Audiophile Home Use

Description:
With an output power of only 20W at 8 ohms, the A1s amplifier delivers the quintessential British sound: delicate, smooth, warm, and rich in tone, full of character. It is an excellent choice for music lovers. Although the original unit was not very expensive, its sound quality rivals that of many high-end machines from much larger brands.

After extensive listening tests and comparisons, we decided to produce and share this model with everyone. The A1s has had a profound impact on audiophiles. For a long time, it was widely believed that Class-A amplifiers sound best when running hot. The A1s was so successful that its successors—the A2 and then the A3—have never matched its reputation or status.

Features:
20W Class-A Amplifier with Hifi Sound Quality
* Aluminum alloy panel
* Stylish heat dissipation design
* High power output
* Damped tactile knob
* Toroidal transformer
* Exquisite circuit layout

Heat Sink & Laser Marking
* Class-A amplifiers generate significant heat during operation. That's why this unit adopts a symmetrical heat dissipation design on both sides, with tooth-shaped heatsinks for efficient thermal performance.
* The enclosure is made from full aluminum alloy, precisely CNC-machined. The laser-engraved markings ensure they won't rust, fade, or peel — a premium finish typically found on high-end audio equipment.
* 10mm heat dissipation baseplate
* CNC precision machining
* Laser-engraved text

Premium-Grade Components
* Large Toroidal Transformer: The amplifier's powerful performance is driven by a high-quality toroidal transformer — the energy source behind its robust output. Much like a car engine, this oversized, seamless A-core transformer delivers a continuous and stable power supply to the amplifier.
* High-Capacity Main Filter Array: Equipped with Japanese 18000uF 35V capacitors (for Nichicon) — 4 per channel — the total filter capacitance reaches an impressive 144,000uF. This ensures ultra-fast charge/discharge cycles for superior dynamic response and deeper bass extension. Note: These are imported original reclaimed capacitors.
* Original Power Transistors for ON Semiconductor: Each channel uses a pair of MJL21193/MJL21194 transistors for ON Semiconductor — commonly found in ultra-high-end Swiss amplifiers. These transistors deliver exceptional vocal clarity, depth, and detail. Their overall performance exceeds that of counterparts for Sanken, providing a rich, fatigue-free listening experience.
* Original Relays for OMRON: Silver-alloy contact relays prevent power-on/off transients and protect against DC output. With long service life and excellent stability, they safeguard your equipment effectively.

Multiple Full-System Protection Mechanisms
* DC Protection System: It automatically monitors internal circuitry and disconnects the speaker output in case of anomalies, ensuring your speakers are always operating in a safe environment.
* Power-On Delay System: It prevents speaker-damaging power surges at startup and eliminates the "thump" sound typically heard when the amplifier is turned on.
* Overheat Protection System: When the internal temperature exceeds safe limits, the system automatically reduces current and output power to protect the amplifier from thermal damage.

Symmetrical Circuit Design & Dual-Channel Power Output
* The fully symmetrical layout and dual-channel power boards deliver strong and stable output, providing ample driving force and letting you experience the music in its most natural and realistic form.

Intuitive Front Panel Interface
* All functions are clearly labeled for easy and intuitive operation. Compatible with a wide variety of audio devices.

Specifications:
* Model: A1s
* Power Output: 20W (8Ω), 25W (4Ω), Pure Class-A (Equivalent driving force of Class-AB 100W×2)
* Frequency Response: 10Hz–40kHz ±3dB
* Signal-to-Noise Ratio: 105dB
* Impedance: 4–8Ω
* Distortion: Less than 0.001% (1kHz, 1W)
* Voltage: 110V/220V
* Dimensions: 335mm × 208mm × 75mm (L × W × H) (Height excludes feet)
* Weight: 5.3kg

Packing List:
* 1 × Set of Power Amplifier
    
Packaging Details:
* Weight: 6kg