The Nu-Vista PAS is a fully balanced, discrete stereo power amplifier with separate power supply unit.
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.
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 Titan 1000W stage, it has separate capacitors for bulk supply, and one each for output devices considerably reducing output impedance and improving dynamics.
The new Nu-Vista PAS is a continued labour of love for Musical Fidelity. Our passion for Nuvistor tubes didn‘t stop.
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.
Unfortunately just as uses for Nuvistor tubes were being explored, the transistor was invented and it was ‘game over’ for Nuvistors. There the matter rested until about fifteen years ago, when Musical Fidelity created the first of its ground-breaking Nu-Vista series.
One famous application was in the famed Neumann U 47 studio microphone. This microphone was highly regarded by artists all over the world, and was used by many top recording artists such as Frank Sinatra, The Beatles, and so on.
Never before in the history of hi-fi have Nuvistor tubes been coupled with state-of-the-art fully balanced and discrete technology and sophisticated modern design techniques. The Nu-Vista PAS & Nu-Vista PAM 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 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 listening to the Nu-Vista PAS as we had creating it.
| Output | |
| Output Power | >300W per channel into 8 Ohms |
| Output Voltage | 49 Volts RMS, 20Hz to 20 kHz; onset of clipping |
| 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 |
| Frequency response | + 0, –1dB, 5Hz to 50 kHz |
| Connections | |
| Line level inputs | 2 pairs line level single ended RCA connectors |
| 2 pairs line level balanced XLR connectors | |
| Line level outputs | 1 pair line level single ended RCA connectors |
| 1 pair line level balanced XLR connectors | |
| Speaker outputs | 2 pairs 4mm banana plug/binding posts per side |
| Trigger input and output | 3.5mm mono jack socket |
| Trigger level | ±5V to ±12V |
| Power requirement | |
| Mains voltages | 115/230VAC 50/60Hz (factory pre-set) |
| 100VAC 50/60Hz (alternative) | |
| Consumption | <0.5W in standby mode |
| 130W on and idle | |
| 1060W maximum | |
| Weight | |
| Nu-Vista PAS unit only, unboxed | 27 kg |
| Nu-Vista PAS in shipping carton | 35 kg |
| Nu-Vista PAS PSU unit only, unboxed | 40 kg |
| Nu-Vista PAS PSU in shipping carton | 50 kg |
| Maximum Dimensions | |
| Nu-Vista PAS (WxHxD) | 483 x 187,5 x 475 (494 with connectors) mm |
| Nu-Vista PAS PSU (WxHxD) | 483 x 187,5 x 475 (478 with connectors) mm |
| Standard accessories | |
| IEC type mains lead | 16-Amp type |
| 2x PA power cable (1 m length) | “Neutrik” type |
| 2x Nuvistor PRE power cable (1m length) | 5-pin XLR |
| 1x Control power cable (1m length) | 4-pin XLR |
| 8x Spike Foot | |
| 8x Spike Foot Cup | |
| 8x Spike Foot Screw | |
| 8x Felt pad for Spike Foot Cup | |
| 8x Felt pad for Standard Foot |
