Musical Fidelity Nu-Vista 300 Amplifier - Dual Chassis Hybrid Amp - Limited Production

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General:

Rare and limited Nu-Vista 300 amplifier from Musical Fidelity which uses the very limited Nuvistor tube. Said to bridge the gap between transistors and tubes perfectly.

Only 500 were ever built and the limited availability of Nuvistors means no others will be built. But don't worry, the Nuvistor tubes have a life expectancy of 100,000 hours. 

Capable of 1000W into 2 ohms due to its high current delivery, this beast should be able to power just about anything you connect to it, yet retain the liquid and easy sound of your favorite tube amp. 

Ownership:

Single Owner

Connections:

Two sets of speaker binding posts for spade connectors, RCA inputs, and Speakon Inputs. IEC power cord.

General Sound:

Neutral sound with little to no coloration 

Cosmetic Condition:

7 - Some Wear and Light Scratches

https://skyfiaudio.com/pages/our-rating-scale

Working Condition:

Working perfectly and tested in our lab.

Included:

Just the unit, unit proprietary umbilical connecting cables, and a power cord

Packing:

Will be packed using our highly developed in-house process and custom packing materials.

Original MSRP:

$5,499

Dimensions:

Amplifier:
330 x 170 x 490mm (W x H x D)

Power Supply:
330 x 170 x 490mm (W x H x D)

Weight:

60 lbs.

Age:

1999

Reviews:

https://www.stereophile.com/solidpoweramps/205/index.html

Link to Manual:

https://www.musicalfidelity.com/uploads/manuals/English/nv300_eng.pdf

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - Speaker Cables - Better

Kimber Summit Series Monocle XL Speaker Cables (PAIR) - Best

Kimber Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR) - Best If Applicable 

Kimber Kable - Power Cords - Better

Testing Process:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.

Specs:

POWER OUTPUT
300 watts per channel into 8 Ohms
600 watts per channel into 4 Ohms
1000 watts per channel into 2 Ohms

FREQUENCY RESPONSE
10Hz - 56KHz + 1dB

S/N RATIO
> 88dB ‘A’ weighted (Ref 1W)
> 113dB ‘A’ weighted (Ref 300W)

THD
< 0.005% at 1KHz
< 0.008% 20Hz - 20KHz unweighted
< 0.003% 20Hz - 20KHz “A” weighted

INPUT SENSITIVITY
1.5V (for full output)

INPUT IMPEDANCE
100KOhm

POWER CONSUMPTION
1.2KW Max