Elevate your listening experience to new heights with the Musical Fidelity Nu-Vista PAS Power Amplifier, now available at Len Wallis Audio. This exceptional amplifier combines the timeless warmth of Nuvistor tubes with state-of-the-art balanced technology, delivering a sound quality that’s both powerful and refined. Designed for audiophiles who demand the best from their stereo system or home theatre, the Nu-Vista PAS is a game-changer in hi-fi audio, offering unmatched clarity, depth, and dynamics for your home sound system.

The Musical Fidelity Nu-Vista PAS Power Amplifier is more than just a piece of equipment—it’s a gateway to an immersive audio experience that transforms your home sound system. Whether you’re listening to your favourite vinyl records, streaming high-resolution audio, or enjoying a blockbuster movie, this amplifier brings every detail to life with stunning clarity and depth. Its ability to project images between speakers creates a soundstage so vivid you’ll feel like you can reach out and touch the music, making it an ideal choice for both stereo systems and home theatre setups.

Technical Specifications for Musical Fidelity Nu-Vista PAS Stereo Power Amplifier

General Specifications

• Type: Fully balanced, discrete stereo power amplifier
• Amplifier Class: Class A buffer stage (Nuvistor valves) with Class AB output stage
• Design: Stereo power amplifier with separate external power supply (PAS PSU)
• Finish Options: Silver or Black (extruded aluminium front and side panels)

Dimensions and Weight

• Dimensions (PAS): 483 mm (W) x 187.5 mm (H) x 494 mm (D, including connectors)
• Dimensions (PAS PSU): 483 mm (W) x 187.5 mm (H) x 475 mm (D, including connectors)
• Weight (PAS): 27 kg
• Weight (PAS PSU): 40 kg
• Total Weight (PAS + PSU): 67 kg

Power Output

• Power Output (8 ohms): 300W per channel
• Power Output (4 ohms): 500W per channel
• Power Output (2 ohms, peak): 1000W per channel
• Current Output: > 100 Amps peak-to-peak (for dynamic headroom and speaker control)

Audio Performance

• Total Harmonic Distortion (THD + Noise): < 0.003% typical (20 Hz–20 kHz)
• Signal-to-Noise Ratio (S/N): > 108 dB (A-weighted)
• Frequency Response: 10 Hz–80 kHz (+0, -1 dB)
• Damping Factor: > 180 (for excellent speaker control)
• Channel Separation: > 90 dB (20 Hz–20 kHz)

Inputs

• Unbalanced Input: 2 x RCA (single-ended)
• Balanced Input: 2 x XLR
• Input Sensitivity: 1.5V RMS (for full output)
• Input Impedance (RCA): 100 kΩ
• Input Impedance (XLR): 100 kΩ

Outputs

• Unbalanced Output: 1 x RCA (for daisy-chaining to additional amplifiers)
• Balanced Output: 1 x XLR (for daisy-chaining to additional amplifiers)
• Speaker Outputs: 2 pairs of high-quality binding posts (suitable for bi-wiring, accepts 4 mm banana plugs, spades, or bare wire)

Valve Configuration

• Nuvistor Valves: 8 x 6S51N Nuvistor valves (four per channel, used in the discrete Class A buffer stage)
• Valve Role: Provides a warm, smooth sound signature with fast transients

Output Stage

• Transistors: 5 pairs of high-power, thermally compensated output devices per channel
• Capacitor Design: Separate capacitors for bulk supply and one per output device to reduce output impedance and improve dynamics
• Chokes: Added for improved supply ripple and pulse current spike reduction
• Bias: Set for over 5W of initial Class A operation, transitioning to Class B to minimise crossover distortion

Power Supply

• External Power Supply Unit: PAS PSU (included)
• Transformers: Dual high-capacity toroidal transformers (housed in PAS PSU)
• Capacitance: High-grade capacitors for stable power delivery
• Power Supply Design: Separate power supplies for audio and control circuits to minimise interference, with choke regulation for improved noise reduction
• Mains Voltage: 230V–240V (50/60 Hz)
• Power Consumption: < 0.5W (standby), 1060W (maximum)

Additional Features

• Display: Colour display with VU meter (for real-time power output monitoring)
• Dimmer Function: Adjustable display brightness
• Trigger Inputs/Outputs: 12V trigger in/out for system integration (e.g., remote power on/off with compatible Musical Fidelity products)
• Protection Circuits: Overload, over-temperature, and short-circuit protection
• Cooling: Passive cooling with fluted sidecheeks for efficient heat dissipation
• Feet: Anti-resonance feet to reduce vibration and improve stability

Materials and Build

• Chassis: Extruded aluminium front and side panels with a steel chassis
• Shielding: Aluminium case acts as a Faraday cage to protect against electromagnetic interference
• Connectors: Gold-plated RCA and XLR connectors for optimal signal transfer
• Binding Posts: High-quality, proprietary speaker terminals (note: central post diameter may be larger than standard 8 mm, potentially requiring specific spade connectors)

Included Accessories

• Power Supply Unit: PAS PSU (with connecting cables, including XLR and Neutrik speakON-style terminations)
• Mains Cable: High-quality IEC power cable
• Manual: User manual with setup and safety instructions