Some of the specs are: - Input sensitivity - 3Vpk-pk for full output - Frequency response - 1Hz - 24Khz@-3dB - Gain - fixed at 29 (32dB) - Output Power - 180Wrms/4ohm - Power Consumption - 239W - Efficiency - 75% - Ripple rejection - very good at -62.7dB - THD+N - 0.013% @ 180Wrms/4ohm The 6 output transistors are 2N3055 and MJ2955 or a close equivalent. All 220mOhm resistors are wirewound or rated 5W at least. The 56ohm resistors are 1W and their driving transistors are BD139 and BD140 The second circuit is the Power Supply circuit (bridge and filtering) for the amplifier. The transformer is 110V(220V) - 35V - 0 - 35V. Recommended capacitor size 2x10mF. Any less and you risk deteriorating the overall quality and/or self oscillations. The preamplifier requires perfect regulation. I suggest LM7812 and LM7912 in the highest ripple rejection topology possible. The ripples should be no more than a couple of mV.