A simple, powerful and versatile class AB transistor amplifier.
The amplifier circuit is symmetrical, the input stage is made on a single-channel op-amp.
The amplifier is assembled on 2 pairs of output transistors 2SA1943 and 2SC5200 TOSHIBA
When using 8 ohm acoustics, the supply voltage can be raised to 55-60V to obtain the equivalent power at 4 ohms.
The module does not require any configuration and is ready to work out of the box. The minimum quiescent current of about 20mA makes it almost completely cold in idle mode.
For passive cooling at a supply voltage close to the maximum, a radiator of at least 1500 sq. cm is required
Subjectively, the amplifier has a powerful, assertive sound, and is able to "handle" most speaker systems.
The module can be recommended to work on a subwoofer speaker or on powerful acoustics of the initial and middle level.

Measurements
Supply voltage bipolar	-52V...0...+52V
Load resistance	4 Ohm
Power maximum, W	227
Testing power, W	150
Quiescent current	20mA
Frequency response (from 40 Hz to 15 kHz), dB	+0.23, -0.59
Noise level, dB (A)	-107,4
Dynamic range, dB (A)	107,3
THD, %	0,0650
THD + Noise, dB (A)	-66,0
IMD + Noise, %	0,0150
IMD at 10 kHz, %	0,0840
Measurement Page
General characteristics
Amplifier class	AB
Maximum supply voltage (bipolar / constant) DC	50V
Minimum supply voltage (bipolar / constant) DC	25V
Module size LxWxH, mm	65x100x30
Number of channels	mono
Output transistors	2SA1943/2SC5200
Weight, kg	0,120