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Old 9th May 2006
He probably fried the power transformer and possible the 78/7915 regulators as well. Also, there are + - 24 volt unregulated rails to power the unbalanced LF351 opamp output. So, you need to check the opamp and the discrete power transistors for this output as well. Replacing the regulators won't help if there's a short on the unregulated transformer's outputs. Also check the mains filter caps as they also may be fried.

This sounds like a complete rebuild if he connected 230 volts into it. The school of hard knocks is an expensive place to go.

Jim Williams
Audio Upgrades