I've never needed to do this but you may want to try inserting a low value current limiting resistor in series with the red or black rail wires. This should help protect the output transistors and possibly allow you to find the fault without blowing any more parts.
Do you have a size and wattage recommendation for the current limiting resistor? Wonder why it just the rail switchers and not the audio outputs?
The rails switchers fail more often than the outputs. It could be that there is essentially twice the effective series resistance in the output current path than in the current path for the rail switchers.
I'd try a 2 ohm 100w (25 or 50w would work as well). You should have one for the power line when testing amps that may have problems. It wouldn't help much in the B+ line for this amp but it should work in the rail line. I recommend the tubular ceramic resistors, if you have to buy one.
I'd try a 2 ohm 100w (25 or 50w would work as well). You should have one for the power line when testing amps that may have problems. It wouldn't help much in the B+ line for this amp but it should work in the rail line. I recommend the tubular ceramic resistors, if you have to buy one.
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