V 10-2 VALVE BASED AMPLIFIER

V 10-2 VALVE BASED AMPLIFIER
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V 10-2 VALVE BASED AMPLIFIER
The V 10-2 features a range of technologies which have
never been seen before in valve amplifiers.
In our view high output power is a fundamental necessity,
but not at the cost of hideous case designs and utopian
expense. We found the solution to this conundrum in new
special high quality valve types which have never been used
before, in combination with an ingenious circuit design
which we have termed SPPP (Single Primary Push Pull). This
eliminates the symmetry problems in the output
transformers of conventional valve amplifiers.
As ever, we consider excellent measured results to be of
extreme importance. However, this is not entirely
straightforward with valve amplifiers, for even some designs
which have gained good test results feature upper limit
frequencies of only 30 to 50 kHz. That’s not enough for us!
Our V 10-2 effortlessly achieves 100 kHz thanks to the
special torroidal audio transformers which SPPP technology
enables us to exploit. A crucially important factor to our
developers was the stability of the amplifier’s sound
qualities and technical performance in practical daily usage.
The problem here is the valves themselves: on the one hand
individual examples from normal production vary
enormously, and on the other the valves are very sensitive in
operation and suffer inevitable ageing effects. To overcome
these problems we have again introduced measures which
we believe to be unique: all valves are subjected to a
sophisticated selection process, and only the units
exhibiting the closest tolerances are approved for use in our
amplifiers. At the same time a micro-processor constantly
monitors all the system’s operational parameters, such as
signal levels, currents and overload margins. All the device’s
activities are recorded by a form of dynamic counter, and
this information is used to calculate the residual run-time of
the valves, so that they can be replaced in good time in
order to maintain the amplifier’s sound quality. The normal
useful life of the valve set is in the range 2000 to 3000
hours, depending on load and stress levels. For example, a
cold start shortens the valves’ lives more than switching on
after the pre-warming phase. Idle current levels can be
displayed and adjusted at any time.
The mechanical construction and case design of an
amplifier of this type must fulfil the most exacting
requirements. Any hint of mechanical jolting or vibration
has a significant adverse effect on sound quality. For this
reason the basic cradle is of strong steel construction,
mounted on four shock absorbers. The external aluminium
components are of sandwich construction, since this is more
efficient at damping body sound, while the thick acrylic
panel suppresses and absorbs vibration and prevents
microphony effects. The audio transformers, the main
transformer and the output stage capacitors are
encapsulated in solid aluminium containers which prevent
resonance effects and effectively disperse generated heat.
Specifications
Nominal output
Load impedance
Bandwidth - 3dB
Total harmonic distortion
2 x 80 Watt RMS
4 or 8 Ohm (switchable)
8 Hz - 100.000 Hz
< 0.07 % at 1 Watt
< 0.5 % at full load
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High level inputs
Output
Valves
Control interface
Remote control
Dimensions (H x W x D)
Finishes
5 switched using gold-contact relays
1 Tape out
2 x ECC83 low-distortion double triode
(pre-amplifier)
2 x ECL82 triode / pentode
(= 6BM8)
(input stage for power amplifier)
2 x ECC99 double triode
with large current supply capacity
(driver stage)
4 x EL519 power pentode
(new old stock)
Special T+A torroidal broadband audio
transformer (output transformer)l
RLink
F 10, included
18 x 44 x 39 cm
Silver aluminium, Titanium
acrylic glass alternatively in grey or blue
We reserve the right to alter technical specifications.
06.02.2014 20:55
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