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Pure Class A Push-Pull Triode Monoblocks
The VPA is a pair of mono block vacuum tube power amplifiers. Equipped with symmetrical and asymmetrical inputs, they offer a power output of 50 Watts through a pure class A output stage with no feedback. Using a pair of matched and individually selected 845 output tubes the VPA offers a clarity of sound second-to-none. Since its introduction in 1998, the VPA has set new standard for
vacuum tube amplifiers, won prestigious awards and, more importantly,
became a reference for a tremendous number of audiophiles all over
the world.
Constructed in machined-aluminum
towers, its highly sophisticated design is based on Nagra’s
simple rule: only the best components, no compromises on quality.
In addition, the VPA uses fully balanced circuitry from input to
output to minimize intermodulation distortion and phase shift as
well as decreasing the need for internal feedback.
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Click here for ENGLISH or FRENCH documentation |
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As a result, the rise time,
slew rate and overshoot characteristics of the Nagra VPA are
uncommonly good compared to other amplifiers, and simply extraordinary
for one based on vacuum tubes. These performance characteristics
are constant whether the VPA is delivering minimum or full
power.
Difficult Speaker Loads and Zero Negative feedback
Vacuum tube
amplifiers seldom drive difficult speaker loads with success.
Using electrostatic or low-impedance dynamic speaker designs
with these amplifiers often yield unpredictable results. With
the VPA, implementing a zero negative feedback design renders
matching difficult speakers much easier. In addition, the VPA
offers 4, 8 and 16 Ω outputs so it
can accommodate even the most demanding loudspeakers. |
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Fast, Deep and Low with Nagra Output Transformers
Proprietary
Nagra output transformers are used to avoid low-frequency saturation
and high frequency ringing so common in other transformer-coupled
output states. Bass notes are delivered with absolute authority
and sound-stage scale delineation is simply superb.
Choice of
845 Tubes
The 845 tubes go through a 24 hour burning and numerous measurements before computer-assisted matching by pairs.
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Inputs
The VPA features both balanced and unbalanced inputs on XLR and RCA connectors.
Monoblock design
The monoblock design offers the
advantage of providing one power unit per channel, this contributes
to the channel separation and thus respects the signal’s
integrity. The amplifiers should now stand close to your loudspeakers,
enabling shorter speaker cables to be employed and thus allows
a better damping factor.
In addition, the tower configuration allows an optimization
of the floor space.
Precise System Matching through the Nagra
Load Match Meter
The
high precision, illuminated Nagra Load Match Meter on each
monoblock amplifier offers a unique function: it allows the
owner to check the perfect operation of the 845 output tubes
and to match each VPA's output precisely with the speakers.
By indicating both the peak DC voltage and current drawn
on the output tube anode, it is easy to spot speaker mis-match
and suggest corrective action. It is our attention to details
like these that ensures complete installation success and
ultimate enjoyment of your favorite music. |
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REW