Soul 170HA is a transformer-coupled single-ended Class A amplifier. The output from the KT170 will drive a pair of output transformers that support both headphone and speaker outputs. The vacuum tube amplification circuit of Soul 170HA is operated in a single-ended, the output transformers provide an alternative phase and compose a balanced output, enabling a balanced driven from a single-ended vacuum tube circuit.
Key Features:
- Premium, powerful vacuum tube-based amp for headphones or home speakers
- Features 1st implementation of matched pair of Tung-Sol KT170 tubes in a single-ended architecture Class A headphone amp
- Authoritative 18W per channel speaker output at 8Ω and max 18W headphone output via XLR Balanced
- 6.3mm (3.5mm), 4.4mm Balanced, and 4-pin XLR Balanced headphone out
- 3 level impedance matching
- Separate power supply chassis for cleaner, low-noise power
- Ultra-premium, heavy-weighted umbilical power supply cables with quick release connectors
Audiophiles love the KT family, and the KT88 has maintained a center role since 1956. There were multiple attempts to develop a new vacuum tube for high-end audio, that rivaled the sonic performance of KT88 with higher power.
The KT170 is the latest attempt from Tung-Sol and by far the best attempt based on Cayin's experience with all the KT vacuum tubes currently available. It features a high-efficiency outboard power supply circuit with substantial power reserves, delivering an authoritative headphone output of up to 18WPC, ushering headphones into a new realm of personal listening experience.
The driver tubes amplify signal voltage so that the rest of the amplification circuit can operate at a very linear condition. The KT170 output tubes, operating in single-ended Class A, will produce completed amplified output without splitting the musical signal into parts.
Multi-stage tube-regulated power supply circuit feeds power to different amplification stages independently. Soul 170HA employs 2x GZ34S rectifier tube from JJ to handle the driver stage high-voltage supply, providing a tube presentation that is more euphonic and nuanced. The rectifier tube converts the incoming power source to DC, providing clean power with minimum interference for the circuit.
Unlike output tubes or driver tubes, the rectifier tubes convert signals without a heavy lifted load and can last for years without deterioration. Since they are not involved in audio amplification directly, there are no matching requirements and they can be replaced on a per-piece basis.
Cayin engineers meticulously designed the gain circuit, independently adjusting the working current of each stage of the vacuum tubes, to allow the Soul 170HA to fully display the unique rich tones of single-ended Class A design. The Soul 170HA provides users with an immersive audio experience, maximizing musicality without scarifying on technicality.
After carefully evaluating different alternatives, Cayin decided to use two indirectly heated dual triode 6SN7 to take care of the voltage amplification given its medium (amplification factor) and low internal resistance. The JJ 6SN7 is impressive for its low noise and balanced tonal balance across the audible frequency ranges. The sound performance is dynamic, with rich details, and offers excellent musical expressiveness.
Physically separated 2 box design, the outboard power supply delivers clean, low-noise electrical power to the amplification circuit in a separated chassis independently. It also provides better heat dissipation even when stacked up, allowing the users to place the amplifiers with flexibility.
Dual power supply transformers deliver high and low voltage separately, minimize electrical interference, and safeguard clean power to the amplifier.
Multi-stage tube-regulated power supply circuit feeds power to different amplification stages independently. It can minimize ripple effect, eliminate circuit interference, and enhance circuit performance of both the voltage and current amplification.
The separated high-rigidity chassis and damping mounts absorb shock and vibrations effectively, isolating noise interference caused by transformer vibrations and magnetic leakage to achieve a higher SNR.
Custom designed silver-plated 6N copper wire to connect between the outboard power supply and main amplification chassis. Separate high and low voltage transmission, with a total of two cables. 6N copper offers excellent electrical conductivity, the high level of purity reduces the presence of impurities that can interfere with signal transmission, and it also ensures consistent performance and longevity of the cables. Independent shielded to minimize external interference as well as interference between independent transmission of multi-stage power supply circuit.
Quick-release connectors from the aviation industry are used at both ends of the cables for connection. 8-pin for high voltage power transmission, and 12-pin for low voltage, making sure the output from multi-stage power supply will feed to different amplification stages independently. Connect and disconnect in seconds, and you'll always get it right.
The Soul 170HA adopts an integrated bias servo circuit design. When replacing vacuum tubes, there is no need for manual adjustment, as the Dynamic Auto Bias servo circuit handles it. It precisely controls the power tubes, ensuring better compatibility with the amplifier. The innovative circuit design enhances safety and prolongs the lifespan of the vacuum tubes.
The front panel of Soul 170HA is made of aerospace aluminum with a matte black anodized finish. The side panels are crafted from North American black walnut wood with unique grain and texture, enhanced by hand polishing for a more sophisticated feel.
Luxurious and exquisite VU meter design, combining high aesthetics with functionality, allowing you to appreciate the charm of details while listening. Theatrically designed tube cage protect the vacuum tubes and prevents accidental contact with the hot tubes during operation.
In the Box:
- Cayin Soul 170HA
- Manual
