04-01-2020, 10:09 AM
Obviously circuit diagrams would help. The amps look simple enough to trace out if all else fails.
If there are no big output caps there must +ve and -ve supply rails. Can you at least verify that they are about equal.
It's possible that some part of the circuit doesn't wake up properly until nearly full supply voltages are present.
Working with a dummy load is definitely the way to go. Not necessarily 8R initially but even 50-100R will give some safe loading and allow you to see how the amp is working.
If there are no big output caps there must +ve and -ve supply rails. Can you at least verify that they are about equal.
It's possible that some part of the circuit doesn't wake up properly until nearly full supply voltages are present.
Working with a dummy load is definitely the way to go. Not necessarily 8R initially but even 50-100R will give some safe loading and allow you to see how the amp is working.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
