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Musical Fidelity NVPAS Nu-Vista Stereo Power Amplifier

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Musical Fidelity NVPAS Nu-Vista Stereo Power Amplifier

Nu-Vista PAS - Overview

Based on our excellent Nu-Vista 800 circuit we decided to go all out “fully balanced” on the Nu-Vista range. The Nu-Vista PAS features the tried and tested Nu-Vista stage featuring 6S51N nuvistors in a discrete class A amplifier buffer.

 

Technical Talk

This is followed by a balanced configuration circuit and balanced input high power, low distortion output amplifier stage. The power stage has 5 pairs of high-power thermally compensated output devices for reliable and stable operation.

Based on the Titan 1000W stage, it has separate capacitors for bulk supply, and one each for output devices con siderably reducing output impedance and improving dynamics. Chokes are added for further improved supply ripple and pulse current spike reduction Bias is set for over 5W of initial class A operation thereafter the stage slides into class B operation at a point where the now much lower discontinuity is easier dealt with than “standard” crossover distortion.


Nu-Vista PAS Power Supply

The Nu-Vista PAS comes with its own dedicated external power supply

To achieve better noise performance, we removed the AC mains power supply from the main unit and built it into another matching box. In this box, we took advantage of the extra space to set up inbuilt mains and output filtering. This quietens up the supplies and results in almost no mains-borne artifacts getting into the sensitive audio circuitry. The Power supply has ON/ Standby LEDs and is controlled from the main unit front panel. If total mains isolation is required, the power supply also has a rear-mounted mechanical rocker switch for full power off.


 

The Legendary Nu-Vista Stage

Never before in the history of hi-fi have Nuvistor tubes been coupled with the state-of-the-art fully balanced and discrete technology and sophisticated modern design techniques. The Nu-Vista PAS & Nu-Vista PAS PSU‘s technical performances are astonishing. They measure like a dream but, more importantly, sound incredible. Silky smooth with enormous transients and an effortless feel that is at once relaxing and involving. Of special note is how they project images between the loudspeakers so that you can almost touch them.

The new Nu-Vista PAS and its PSU were a continued labour of love for Musical Fidelity. We are passionate about what we do and passionate about Nuvistor tubes as we have always been. We hope that you derive as much pleasure from listening to the Nu-Vista PAS as we had created it.


Nuvistor Tubes

Nuvistor tubes were invented in the 1950s to solve the many shortcomings of conventional tubes. Unlike them, Nuvistor tubes offer very high reliability, low microphony, low noise, consistency from batch to batch, small size, relatively low power consumption and great technical performance.

One famous application was in the Ampex MR-70, a costly studio tape recorder whose entire electronics section was based on nuvistors. Another limited application of this very small tube was in studio-grade microphones from that era, the AKG/Norelco C12a, which employed the 7586, being a good example.

 

Key Features

Amplifier

  • High output power, greater than 300W into 8 ohms, 500W into 4 ohms, 1000W peaks into 2 ohms
  • Output Voltage: 49 Volts RMS
  • Output Current: 130 Amps peak to peak
  • Damping factor: 200
  • Output devices: 5 pairs per channel
  • Gain: 16x (23.5 dB)
  • THD+N: < 0.003 % typical, 20Hz to 20 kHz
  • Signal/noise ratio: >108dB ‘A’-weighted
  • Channel separation: >96dB
  • Input impedance: 100 k Ohms
  • Input sensitivity for full output: 3 Volts RMS

In & Output

  • Speaker outputs: 2 pairs 4mm banana plug/binding posts
  • Trigger input and output: 3.5mm mono jack socket
  • Trigger level ±5V to ±12V