Cayin CS-805A silver

The Cayin CS-805A is a tube integrated amplifier operating in Class A. It delivers 2 x 50 watts of power in a single-ended configuration, a notable feature for this type of design. Its architecture is based on the combination of three types of tubes: 805A for power, 300B for the preamplification stage, and WE6SN7 for control functions, each contributing to the sound reproduction according to its properties. The CS-805A offers several connectivity options and allows for adjustments to the sound signature, providing a certain flexibility depending on listening preferences and associated systems.

Exceptional Single-Ended Architecture

The essence of the CS-805A lies in its pure Class A single-ended design, renowned for its superior transparency and musicality. This audiophile approach prioritizes quality over quantity, with a meticulous tube layout: the WE6SN7 handles voltage amplification, the prestigious 300B drives the intermediate stage, while the imposing 805A delivers the final power. This rare combination leverages the complementary qualities of each tube—the precision of the 6SN7, the harmonic richness of the 300B, and the controlled power of the 805A.

The entirely hand-wired point-to-point circuit reflects a handcrafted approach that optimizes signal quality. Unlike standard printed circuit boards, this method minimizes interference and preserves the integrity of the audio signal. The wide-bandwidth EI output transformers ensure faithful reproduction from 20Hz to 35kHz, covering the entire audible spectrum with notable extension at the extremes.

Precisely Adjustable Sound Signature

The unique feature of the CS-805A lies in its ability to offer a customizable sound signature via two distinct systems. The switchable negative feedback adjustment between 0dB and -3dB substantially alters the amplifier’s character. At 0dB, the sound is open and airy, rich in micro-details and spatialization. At -3dB, the reproduction becomes more controlled, with increased precision and characteristic smoothness.

The second adjustment system concerns the bias of the 805A power tubes, accessible via an integrated display on the top of the unit. This device makes it easy to optimize performance and extend tube life, while the hum balance control allows fine-tuning of the 300B tubes to eliminate any unwanted noise. These fine adjustments, usually reserved for high-end modular amplifiers, are accessible here without opening the chassis.

Versatility and Broad Compatibility

The CS-805A transcends the role of a traditional integrated amplifier thanks to its remarkable versatility. Its three RCA line inputs allow connection of various analog sources, while the dedicated pre-in input transforms the unit into a power amplifier. This feature is valuable for integration into a home theater system with an external AV processor or for use with a specialized preamplifier.

The front-panel headphone output, often overlooked on tube amplifiers, receives special attention here with a dedicated high-quality circuit. This section offers performance worthy of specialized headphone amplifiers, capable of efficiently driving most audiophile models, even those with high impedance.

Despite its tube design, the CS-805A delivers a substantial 2 x 50 watts of power, sufficient to drive the majority of loudspeakers on the market with authority. This power reserve, unusual for a single-ended amplifier, allows pairing with speakers of average sensitivity without compromising musical dynamics.

Premium Components and Sophisticated Protection

The CS-805A’s exceptional sound quality stems from the meticulous selection of audiophile-grade components. The motorized Alps potentiometer ensures precise volume control and outstanding durability. The porcelain tube sockets, superior to plastic alternatives, guarantee perfect electrical insulation and better heat dissipation.

The oversized toroidal transformer provides stable power even during the most demanding musical passages, while selected capacitors and carbon film resistors contribute to overall sonic transparency. This uncompromising approach partly explains the unit’s substantial weight (38 kg), reflecting the quality of the internal components.

The longevity of the tubes and circuits is ensured by several sophisticated protection systems. The soft start and high-voltage power-on delay protect the fragile tubes from electrical shocks at startup. Easily accessible high-voltage fuses intervene instantly in the event of tube failure, thus preserving the integrity of the surrounding circuits. These protections, usually reserved for professional equipment, demonstrate the attention paid to long-term reliability.

Technical Specifications

General Features

• Type: Class A single-ended tube integrated amplifier
• Output Power: 2 × 50 W RMS at 8 Ω
• Architecture: Combination of 805A + 300B + 6SN7
• Sound: Pure and emotional, thanks to single-ended Class A design

Tubes and Amplification

• Power Tubes: 2 × 805A
• Driver Tubes:
  • 2 × 300B for the driver stage
  • 2 × WE6SN7 for voltage amplification
• Porcelain tube sockets

Connectivity

• Inputs:
  • 3 × line inputs (RCA)
  • 1 × preamp input (Pre-In) allowing use as a power amplifier
• Front-panel headphone output, compatible with most high-end headphones
• Remote control included with memory for last settings

Settings and Customization

• Bias adjustment:
  • Built-in display for easy adjustment of 805A tubes
  • User-accessible with indicator on top of the amplifier
• Hum balance control:
  • Manually adjustable for 300B tubes
  • Accessible from the outside
• Switchable negative feedback via remote:
  • 0 dB: open, fluid sound, rich in detail
  • -3 dB: smooth, precise, controlled sound

Protection and Safety

• Soft Start circuit
• High-voltage delay for controlled power-up
• Accessible high-voltage fuses for instant protection in case of tube failure
• Easily installable tube cover for protection (optional)

Quality Components

• Oversized toroidal transformer for stable power supply
• Wide bandwidth EI output transformers
• Audio-grade capacitors
• Carbon film resistors
• High-quality Japanese ALPS motorized potentiometer
• Thick silver-plated signal cables

Construction and Design

• Robust chassis with premium finish
• High-precision point-to-point wiring for performance and reliability
• Fully hand-assembled
• Vintage-inspired aesthetics
• Available colors: black or silver (depending on version)

Physical Specifications

• Dimensions (W × D × H): approx. 430 × 445 × 240 mm
• Weight: approx. 36 kg