Cayin Soul 170P Class A KT170 Tube Power Amplifier

Description Cayin Soul 170P Class A KT170 Tube Power Amplifier The Cayin Soul 170P Class A KT170 Tube Power Amplifier is their latest power amplifier built upon over 32 years of Cayin’s expertise in vacuum tube amplification. Designed to deliver exceptional musicality and power, it adopts a Class A architecture with powerful TUNG-SOL KT170 tubes. This is also the very first time the team at Cayin have implemented Class A amplification in our Soul series amplifier, aiming to present a fresh and emotional take on the KT170 sound. The Soul 170P offers both Stereo and Mono operating modes to accommodate speakers with higher power demands.     View Cayin Audio Products >> Darko News Release >> theaudiotaylor.com Review >>   Features Tubes & Topology At the heart of the Soul 170P are four TUNG-SOL KT170 beam tetrodes, operating in a Class A push-pull configuration. The amplifier also features: Voltage Amplification Tubes: 2 × 12AU7 – In the voltage amplification stage, two JJ 12AU7 tubes are responsible for initial signal gain, providing the necessary voltage amplification before driving the output stage. Their low distortion and noise characteristics contribute to stable signal handling. Driver Tubes: 2 × 6SN7 – Employed in the driver stage, the JJ 6SN7, known for its musicality and powerful drive, contributes to a sound that’s both emotionally engaging and analytically revealing. Rectifier Tube: 1 × 17AX4GT – This classic rectifier tube supplies a stable DC voltage to the driver stage, ensuring reliable performance and a refined sound with beloved tube body musical expression. Flexible Operating Modes Stereo Mode: 60W (Ultralinear, per channel) Mono Mode: 120W (Ultralinear, per channel) Users can easily switch between Stereo and Mono operation using a secure rear-panel switch, allowing the Soul 170P to be used in both two-channel and high-power mono configurations. Negative Feedback Circuitry To achieve a more refined and natural sound presentation, the Soul 170P employs a carefully tuned Negative Feedback (NFB) circuit. Cayin engineers applied a moderate global feedback loop, striking a balance between control and musical expression. In addition, the Soul 170P features two selectable NFB levels—High and Low—allowing users to fine-tune the amplifier’s sound signature. Choose Low for a more open, expressive, and emotionally engaging sound, or High for tighter control, improved precision, and a more analytical presentation. This flexibility allows the Soul 170P to fully showcase their character across a wide range of speakers and musical genres. Dynamic Auto Bias The Soul 170P features a fully integrated Dynamic Auto Bias servo circuit, allowing seamless power tube replacement without manual adjustment. This system precisely regulates the operating status of each KT170 tube, ensuring optimal matching and extending tube lifespan—all while maintaining operational safety and tube longevity. Component Selection & Internal Build The amplifier is hand-assembled with point-to-point wiring, ensuring low signal loss, minimum crosstalk and interference. Key components include: Silver-plated internal wiring Aluminum alloy anti-resonance feet Customized hand-wounded Toroidal power transformer and EI wide-band output transformer Protective Features Tube soft-start circuit (60-second delay) MCU-controlled protection logic BMI indicators (to detect power tube faults and automatically engage safety mode) Connectivity Inputs: 1 × XLR, 1 × RCA Speaker Terminals: 4Ω and 8Ω outputs   FAQ’s What type of tubes does the Cayin Soul 170P use? The Soul 170P uses KT170 power tubes in a pure Class A push-pull configuration, delivering high power with exceptional tonal richness. Is the Soul 170P a fully Class A amplifier? Yes. It operates strictly in pure Class A, ensuring maximum linearity, smooth harmonic structure, and a highly natural presentation. Does the Soul 170P require a matching preamplifier? Yes. The Soul 170P is a power amplifier only, so it needs a compatible preamplifier to control volume and source selection. How much power does the Soul 170P produce? It delivers 100W per channel of pure Class A power using KT170 tubes, offering remarkable control even with demanding speakers. What makes the Soul 170P different from the Soul 170i? While the 170i is an integrated amplifier, the 170P is a dedicated power amp, offering greater headroom, higher current delivery, and optimized circuit design for amplifier-only performance.   Specifications Rated Output Power Stereo Mode: 32W 32W (RMS, Triode mode) 60W 60W (RMS, Ultralinear mode) Mono Mode: 64W (RMS, Triode mode) 120W (RMS, Ultralinear mode) Frequency Response: 8Hz – 70kHz (–3dB, RCA/XLR) Total Harmonic Distortion: 0.2% (1W/1kHz); less than 2% at rated output power Signal-to-Noise Ratio 105dB (RCA, A-weighted) 102dB (XLR, A-weighted) Input Sensitivity 820mV (NFB: LOW) 960mV (NFB: HIGH) Input Impedance: 18kΩ Output Impedance: 4Ω, 8Ω Input Terminals: 1 × RCA (pair), 1 × XLR (pair) Tubes Used: KT170 × 4 12AU7 / ECC82 × 2 6SN7 × 2 17AX4GT × 1 Dimensions: 430mm × 420mm × 238mm Net Weight: 37.5kg Maximum Power Consumption: 420W (Maximum)