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RKV - HAA ( OTL head amp )
RKV - HAA ( OTL head amp )
Table of contents
1.
Introduction and general information
2.
3.
4.
5.
6.
7.
9.
Warranty
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1.Introduction and general information
Dear client, we congratulate you with your purchase of this superb AUDIOVALVE HiFi component.
To safeguard maximum functionality and to avoid problems up operation, it is important
that you carefully study this user manual and that you follow all instructions therein
precisely!
The RKV Mk II excels through a number of technical details that are unique for a tube based device
in this price category. By design only tubes are found inside the signal path of the RKV. Solid state
electronics are only used to create a stable voltage supply and to compensate for the low production
tolerances of tubes. The RKV ist build in double mono, i.e. each channel has its own power supply.
Even in devices at a much higher price range this feature is not a standard. For the technicians
amongst us; the RKV has been build as a differential amplifier, and therefore the output voltage is
always in phase with the input signal. Of course an ALPS potentiometer is used to control volume.
Like all other Audio Valve amplifiers the RKV is build inside a hard-coated case of laser cut steel with
gold-plated terminals. A few important notes:
The most successful Audio Valve tube amplifier is the RKV, that has been launched in 1984.
Traditional tube technology has been discarded and through new and uncommon solutions a concept
has been created, that was and is unique in the construction of amplifiers. However, modern solid-
state technology was not discarded and thus a product was build that reflects 40 years of
electronical development. The concept is copy protected by the patent DE 3200 51T.
Why a headphone amplifier? Can't we simply use the output of a receiver? The answer is a clear
NO. To faithfully reproduce the extreme dynamic range that modern CD-players allow, high quality
dynamic headphones need driving voltages that are much higher than those provided by the power
supplies of transistor devices. To allow adequate output levels was one of the requirements for the
new amplifier. In addition short-circuit protection and a technically impeccable reproduction with a
typical tube sound were major design goals. All these requirements were fulfilled with the RKV.
The concept of the RKV has no output transformer. It is a typical example of an OTL design. The
only problem that remained was to eliminate the signs of wear and tear normally associated with
tubes, e.g. increasing tolerances, humm, microfonie, etc. These problems generally take a lot of
effort to deal with.
By using a high-quality opamp a DC-servo could be created that eliminates all the negative aspects
of tubes. Even the base line settings are automatically stabilised, independent of the age of the
tube. Thus even tubes can be used that are approaching their end of life.
In summary, the servo control system prevents any losses in quality of sound during the entire life-
time of the tubes.
In case your headphone has a low impedance, we recommend to use the "Impedanzer" which has
outputs for 8 - 16 - 32 - 64 Ohm headphones. Also high-efficiency loudspeakers can be driven.
_________________________dynamic headphone amplifier____________
_________________________dynamic headphone amplifier____________