CLASS A/CLASS A SE Integrated amplifier
State of art pure Class A integrated amplifier
Available colors
Technical description
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.
Technical features
Power on 8Ω load
50W classA
Power on 4Ω load
Power on 2Ω load
Line Gain
12 dB
THD + N (1W, 8Ohm 1 KHz)
0,02 %
Slew Rate
30 V/μs
Frequency Response(Att. 0dB, -3dB band)
1 Hz - 160 KHz
320 x 445 x 480 mm
61.5 Kg
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La società AF Group SRL, CF 03352850139, ha ricevuto nel corso dell’esercizio 2020 aiuti di Stato di cui all’art. 52, Legge n. 234/2012 oggetto di obbligo di pubblicazione nel Registro Nazionale degli Aiuti di Stato che sono ivi indicati nella sezione trasparenza a cui si rinvia.
AF Group SRL
Via Cesare Battisti 126G
51015 Monsummano Terme
Tel. +39 0572 030964
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