State of The Art. CLASS " A" Integrated Amplifier
Features:
Two
toroidal, 400VA transformer, one per channel.
Dual mono design. Pure
class A operation up to 50W at 8
Ohm.
Only
double-sided metallized polypropylene film capacitor in the signal path.
The preamplifier power supply is stabilized using discrete
components linear regulators. The
first amplification is before the attenuator to optimize the coupling with the
source. The input stage of the
preamplifier is realized with two low noise bipolar transistor (MPSA18). The internal stages are DC coupled and the
offset is reduced by means of an integrating amplifiers.
The input attenuator is realized with two cascaded integrated
resistance network without integrated output buffer. High current capability.
The protection and control sections are galvanically insulated from
the analog sections to minimize the digital noise. No mains fuse.
The mains current is measured at the input of the transformer (with
a current probe) and in case of malfunctions it's shutted off. The voltage of both channel is measured by
means of optocoupler to avoid any ground loop.
The DC offset on the output (loudspeakers) is also monitored by
means of optocouplers. The
protections are realized with a Programmable Logic Device
(PLD), more fast and reliable if compared to a
microcontroller.
Specifications:
Line Gain: 12 dB
Total Harmonic Distortion + N (1W, 8 Ω, 1 KHz): 0,02 %
Slew Rate (Nota11): 30 V/μs
Frequency Response (Nota2): 1 Hz - 160 KHz
Noise Level (Nota10):
-130 dB
SNR (Nota9): > 100 dB
Output
power:
50 W classA / 8 Ω p.c.
100 W / 4 Ω p.c.
200 W / 2 Ω p.c.
Inputs: 5 Unbalanced Inputs + 1 Balanced Input
Outputs: Tape Out
Dimensions (W x H x D): 445 x 320 x 480 mm (17,5 x 12,6 x 18,9 inch)
Weight: 61,5 kg (135,6 lbs)
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