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Amplificateur integre CLASS A / CLASS A SE
Amplificateur intégré de haut de gamme en pure classe A.
Couleurs disponibles
Description technique
Two toroidal, 400VA transformer, one per channel. Dual mono design. Pure class A operation up to 50W @ 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 PLD (Programmable Logic Device), more fast and reliable if compared to a microcontroller.
Specifications techniques
Puissance sous 8 Ohm
50W classA
Puissance sous 4Ω
Puissance sous 2Ω
Gain de ligne
12 dB
THD + N (1W, 8Ohm 1 KHz)
0,02 %
Slew Rate
30 V/μs
Reponse en frequence (atten. 0dB, Banda a -3dB)
1 Hz - 160 KHz
320 x 445 x 480 mm
61.5 Kg
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AF Group SRL
Via Cesare Battisti 126G
51015 Monsummano Terme
Tel. +39 0572 030964
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