Cayin Soul 170HA Vacuum Tube Headphone Amplifier - Type UK
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Product Overview & Specifications
The Cayin Soul 170HA (Type UK Model) is a flagship two-chassis vacuum tube headphone amplifier and Class A integrated speaker amplifier. Specially manufactured for the UK market with bespoke 240V transformers, the Soul 170HA features a twin Tung-Sol KT170 beam tetrode output section operating in single-ended Class A configuration, paired with 6SN7 voltage amplification driver tubes and dual JJ GZ34S tube rectifiers.
Designed around an outboard power supply connected via industrial aviation-grade quick-release cables, the Soul 170HA isolates sensitive audio stages from transformer vibration and electrical noise. The amplifier features custom hand-wound output transformers for driving both passive loudspeakers and demanding headphones, dynamic auto-bias circuitry, 128-step electronic ladder volume control, point-to-point hand wiring, and selectable Triode/Ultralinear operation modes combined with dual tonality settings.
KEY FEATURES & PROPRIETARY TECHNOLOGIES
- Single-Ended Class A Architecture: Driven by flagship Tung-Sol KT170 beam tetrodes operating in single-ended Class A to provide pure, un-split signal amplification.
- Dual-Chassis Power Isolation: Outboard power supply houses separate high- and low-voltage transformers to isolate power line interference from the main amplification circuit.
- Dual Tube Rectification: Utilises 2x JJ GZ34S rectifier tubes within a multi-stage regulated power supply to feed driver and output stages independently.
- Custom In-House Hand-Wound Transformers: Output transformers incorporate balanced-driven phase splitting, enabling true balanced headphone output from a single-ended tube circuit.
- Dynamic Auto-Bias Servo Circuit: Automatically monitors and sets optimal bias levels for output tubes, extending tube life without requiring manual adjustments.
- Selectable Triode / Ultralinear Modes: Allows switching between smooth, textured Triode mode and open, dynamic Ultralinear mode.
- Precision Volume Control System: Combines a physical ALPS carbon film potentiometer with dual JRC MUSES72320V electronic resistor ladder chips for 128 volume levels with 0dB channel gain imbalance.
- Point-to-Point Hand Wiring & BMI Protection: Point-to-point hand-wired signal paths combined with a Bias Monitoring Indicator (BMI) protection system that shuts down the circuit if abnormal tube conditions are detected.
SPECIFICATIONS
| Specification | Detail |
|---|---|
| Product Category | Flagship Tube Headphone Amplifier & Class A Speaker Integrated Amplifier |
| Brand / Model | Cayin — Soul 170HA (Type UK 240V Model) |
| Amplification Topology | Single-Ended Class A Tube Circuitry (Transformer-Coupled Balanced Output) |
| Vacuum Tube Complement | 2x Tung-Sol KT170 (Power Output), 2x JJ 6SN7 (Driver/Voltage), 2x JJ GZ34S (Rectifiers) |
| Chassis Design | Two-Box Outboard Power Supply Configuration with Aviation Quick-Release Connectors |
| Speaker Power Output | 18 Watts per Channel into 8 Ohms (Pure Class A) |
| Headphone Outputs | 1x 4-Pin XLR Balanced, 1x 4.4mm Pentaconn Balanced, 1x 6.35mm (1/4") Single-Ended |
| Headphone Output Power (4-Pin XLR @ 60 Ω) | Ultralinear Mode: 15 W | Triode Mode: 12 W |
| Headphone Output Power (6.35mm SE @ 60 Ω) | Ultralinear Mode: 11 W | Triode Mode: 7 W |
| Headphone Output Power (4.4mm Balanced @ 60 Ω) | Ultralinear Mode: 2.5 W | Triode Mode: 2 W |
| Headphone Impedance Selection | Low (L): 8–64 Ω | Medium (M): 65–250 Ω | High (H): 251–600 Ω |
| Operation & Tonality Modes | Triode Mode / Ultralinear Mode | Dynamic Tonality / Soft Tonality |
| Volume Control | 128-Level Precision Resistor Ladder Engine (ALPS + JRC MUSES72320V) |
| Internal Wiring & Circuit Layout | Point-to-Point Hand-Wired Architecture with Bias Monitoring Indicator (BMI) System |
| Power Supply Transformer | UK Specific 240V Multi-Stage Dual Toroidal Transformer Power Supply |
| Enclosure & Accessories | High-Rigidity Machined Aluminium Chassis | CNC Aluminium Remote Control |
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Cayin Soul 170HA Vacuum Tube Headphone Amplifier - Type UK
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