|500,000 yen(September, 2001 release)
Controlled power amplifier which carries LEF which Mr. Carlos Candeias developed.
The single ended circuit where one transistor processes all
the music signals is used for AMP71. There is no variation of a dynamic range
started when a music signal is not made half a wave of to divide to + and - side and the transistor has been arranged for +-each polarity of every [ each ] like
many other amplifier.
Moreover, efficient high power with little generation
of heat with a pure Class-A is realized by carrying an original LEF circuit.
Since good magnification of the stable linearity by a LEF circuit is
possible, the NFB loop became unnecessary fundamentally and the shortest
straight signal course with perfect unreturned amplifier has been realized.
Original differential full balance circuitry is adopted, and the music
signal is processed in the state where it dissociated completely from an input
terminal to all the domains of volume control or power amplifier, and also a
Furthermore, if perfect dual monophonic composition is
adopted and the inlet of AC power source is removed, it is completely
symmetrical structure from the power supply circuit and input terminal carrying
the toroidal transformer of 650VA to the speaker terminal.
surveillance circuit in which the protector of the high-speed operation which
eliminated the mechanical contact was carried is carried in the protection
circuit, and current, voltage, direct current-offset, a power supply circuit,
etc. are checked.
The thin film resistor of 100 steps is used for the
volume control mechanism, and it has structure which changes a step by single
FET controlled with high precision.
By this, right and left have acquired uniform channel balance and stability
without a variation per hour completely.
In addition to two balance inputs and four imbalanced inputs,
the RCA tape output is carried.
All the incoming signals are changed by the
pulse-control relay installed in the optimal position on a substrate.
||Controlled power amplifier
||XLR balance: Two lines
RCA unbalance: Four lines
||Tape output: One line
||27dB (imbalanced input)
||0.018% or less
||Width 435x height 140x depth of 442mm