60 Watt Audio Power Amplifier

In the original circuit, a three-diode string was wired in series to R10. Two of these diodes are now replaced by a red LED in order to achieve improved quiescent current stability over a larger temperature range. Thanks to David Edwards of LedeAudio for this suggestion. The value suggested for C1 and C2 in the Power Supply Parts List is the minimum required for a mono amplifier.
60 Watt Audio Power Amplifier - schematic

For optimum performance and in stereo configurations, this value should be increased: 10000 µF is a good compromise. A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of R1, R3, C2, C3 and C4 and the ground input wire. Connect R7 and C7 to C11 to output ground. Then connect separately the input and output grounds to the power supply ground.

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