Hi. I have this amplifier that when it works at a certain volume, the overload protection is triggered (increased current on the emitter resistors of the output tr's). The point is that it only does it when speakers are connected to the output, in tests with a resistive load of 8 ohms, it never happens, I tested at 100Hz, 1 KHz and 10 KHz, also with music and it went down to 6 ohms and nothing. Could this be normal? The equipment is in excellent condition, as I am very fond of recapping for the simple fact of steel waiting for magic solutions, I do not see corrosion from the famous glue. Attached videos of the failure and the tests. Check the components involved in the protection circuit but I do not find anything out of value. Any ideas?. Thanks in advance.
AU517 fail.mp4 - Google Drive
AU517 test 1-1.mp4 - Google Drive
AU517 test 1-2.mp4 - Google Drive
AU517 fail.mp4 - Google Drive
AU517 test 1-1.mp4 - Google Drive
AU517 test 1-2.mp4 - Google Drive
Look for out-of-spec resistors or bad solder joints in the output stage of both channels. These can throw symmetry out of whack and cause protection to trigger over a certain output current.