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| Output power (4-pin XLR) | <18,000 mW per channel |
| Output power (4.4mm) | <4,000 mW per channel |
| Frequency response (-3dB) | 10Hz-32Khz |
| SNR | <110dB |
| THD | <0.3% |
| Weight (chassis combined) | 40.5KG |
| Dimensions (stacked) | 330 x 400 x 345mm |
Single-ended Class A KT170 Vacuum Tube Headphone/Speaker Amplifier
Tung-Sol KT170 is an octal-based beam tetrode vacuum tube, it is the 2021 newly released flagship of the KT (kinkless tetrode) tube family.
Audiophiles love the KT family, and the KT88 has maintained a central 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 one based on our experience with all the currently available KT vacuum tubes.
Thanks to excellent circuit design and outstanding load-driving capacity, the Soul 170HA can easily present a broad soundstage with tremendous details and musicality when paired with speakers.
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. Cayin engineers meticulously designed the gain circuit, independently adjusting the working current of each vacuum tube stage, allowing 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, we 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. We are impressed by the JJ 6SN7 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
Empowering with Ample Energy Physically separated 2 boxes design, the outboard power supply delivers clean, low-noise electrical power to the amplification circuit in a separated chassis independently. Dual power supply transformers deliver high and low voltage separately, minimize electrical interference, and safeguard clean power to the amplifier.
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.
The 2 box design also provides better heat dissipation even when we stack them up, allowing the users to place the amplifiers with flexibility.
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 the multi-stage power supply will feed to different amplification stages independently. Connect and disconnect in seconds, and you’ll always get it right.
Multi-stage tube-regulated power supply circuit feeds power to different amplification stages independently. Soul 170HA employs a 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 and provides clean power with minimum interference for the circuit. Unlike output tubes or driver tubes, the rectifier tubes convert signals without heavy lifting load, they can last for years without deterioration. Since they are not involved in audio amplification directly, there are no matching requirements, they can be replaced on a per-piece basis.
Transformer Coupled Balanced Driven 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 drive from a single-ended vacuum tube circuit.
Transformer plays a vital role in our amplifiers. The choice of transformer core, specification of copper wire in different parts of winding, and the winding instruction affect the performance and sound signature of our amplifiers. We design and wind all the power supply and output transformers in-house. This becomes our critical core competence and it allows the engineers to have total freedom in specifying the transformers for the circuitry they developed.
Tendering, smooth and elegant, Holography with sharp image, Suitable for vocals, string music, and mid-range focused genre
Open, bold, with great momentum, Soundstage will open up, Suitable for orchestral, OST, and music with a wide dynamic range
Dense, fast and authoritative, prominent dynamic with contrast. Forceful and exciting quality.
Relaxing, delicate and peaceful, reveal low-level details. Engaging and involving quality.
The Soul 170HA innovatively 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. Precisely controls the bias of the power tubes, ensuring better compatibility with the amplifier. The innovative circuit design enhances safety and prolongs the lifespan of the vacuum tubes.
The volume control circuit comprises a custom ALPS carbon film potentiometer and a pair of JRC MUSES72320V electronic volume chips. The ALPS volume potentiometer acts as a physical motion sampler, and the MCU controls two low-noise low-distortion electronic controlled resistor ladder analogue volume chips to achieve 128 levels of high precision volume control, making it more stable and reliable than traditional potentiometers. The 170HA’s high-precision volume control circuit ensures an 0dB gain difference between the two channels.
To control the volume of the amplifier smoothly in both speaker and headphone setups, we provided a remote volume controller as an alternative to the ALPS potentiometer The remote control uses a CNC aluminium chassis with a sandblasted surface, giving the user the sensation of touching the amplifier when adjusting the volume.
The Soul 170HA uses an MCU to manage the entire headphone amplifier, incorporating multiple protection circuits and startup sequences to provide comprehensive protection from power on, playback, to power off. This safeguards the vacuum tubes while ensuring the amplifier always operates in an optimal state
The vacuum tubes used in the Soul 170HA are manually tested and matched. They undergo strict performance testing, a 48-hour ageing process, final measurements after installation on the amplifier, and a listening test to ensure high standards of channel uniformity.
using point-to-point wielding is time-consuming but ensures the shortest signal path with low signal loss. It also isolates audio signal, grounding, and high voltage power from cross-infecting each other, preventing mutual interference and ensuring the performance and reliability of the Soul 170HA
1. Source Selector
2. Output Selector
3. Amplification Output Selector Triode / Ultralinear
4. Tonality (Timbre) Selector DYNAMIC/SOF
1. Front Panel Headphone Output Selector
2. Impedance Match Selector
3. Volume Control
4. 4-pin XLR Balanced Phone Out
5. 4.4mm Balanced Phone Out
6. 6.35mm Single-ended Phone Out
Power Supply
1. Front Panel Power On/Off
2. Power Indicator
Rear Panel
1. Balanced Input (XLR)
2. Single-ended Input (RCA)
3. Speaker Terminal (Right)
4. Speaker Terminal (Left)
5. Power Supply Input (High Volt.)
6. Power Supply Input (Low Volt.)
Power Supply Rear Panel
1. Main Power Input (AC Inlet)
2. Fuse Indicator (High Volt.)
3. Fuse (High Volt.)
4. Fuse (Low Volt.)
5. Fuse Indicator (Low Volt.)
6. Power Supply Output (High Volt.)
7. Power Supply Output (Low Volt.)
As a company our primary goal is to provide a seamless service that results in customer satisfaction. We aim to deliver within 3 working days. Unfortunately, there may be occasions where this time frame may not be met due to unforeseen circumstances; in this instance, we deliver product/s as soon as we can. All delivery charges are included within the prices quoted, unless otherwise specified.
All small items are usually delivered between 9am and 6pm, on a Monday to Friday, unless a Saturday delivery is requested. Follow My Parcel is an industry-changing innovation from DPD Local, which will give your customers unparalleled levels of information and peace of mind.Not only will your customers receive a one hour delivery timeslot, but they’ll now also be able to track the progress of their parcels on a map as our drivers make their way to the delivery addresses. Follow My Parcel will:
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