New memberUsername: Klow1
Sydney, NSW Australia
Post Number: 1
Platinum MemberUsername: Jan_b_vigne
Post Number: 17895
I'm guessing the people who suggested things aren't technicians. Level changes are typically the result of added resistance to the signal path. Unless a cable is clearly defective it cannot add that much resistance. Caps are unlikely though that doesn't mean a cap might not be defective in a circuit with other components. Often one component fails due to another component's failing and therefore the downstream component is delivered the wrong Voltage.
The answer here is simple; if you don't have any idea what at fault and you have no tools to troubleshoot the circuits, you are in no position to try to repair the amp. Keep your hands out of a potentially harmful situation and let a qualified tech troubleshoot the amp. Ask for an estimate of repair costs before OK'ing any work.