Differences from the original board

• removed the gap in the polygon, the feedback is made by a jumper
• moved the input connector slightly to the side
• part of the output transistor wiring has been moved to the other side, and the transition between the layers in the Q9 base circuit has been removed
• increased the size of the capacitors to 18mm

Original description

• Maximum output power (W) - 36(18) W, Rn = 4(8) Ohm;
• Amplifier supply voltage (V) - ± 22V
• THD (%) - 0.0007 - 5W / 8 Ohm (quiescent current 1.2A)
• THD (%) - 0.003 - 15W / 8 Ohm (quiescent current 1.2A)
• Rated input voltage (V) - 2.5;
• Gain - 8.2;
• Output stage quiescent current (mA) - 600mA - 1.4A

More Details: http://audiohobby.ru/articles/usilitel-moschnosti-ah-amp1-v-ekonomichnom-klasse-a.html

Original board: https://www.pcbway.com/project/shareproject/Class_A_Amplifier_AH_AMP1.html