Hi all. First, total newbie, with just enough knowledge to probably make things worse. I appreciate any basic help/advice I can get here. I downloaded the schematic, for curiosity sake really. I知 not understanding the values though or how to test them. I知 very familiar with & work in residential electrical, and have a basic fluke meter for that. Amplifier circuitry is a whole another world...

From other posts here - I started by making a light bulb limiter. Using a 75w bulb, when the amp is on the bulb is about half that of full brightness.

The power indicator LEDs on the back and front do not light up. Other than the slight speaker hum, you wouldn稚 know its on.

Upon opening it up - 2 LEDs inside do light up (D24 & D36).

I see 3 fuses - All continuity test ok.

Disconnecting the speaker, and with power on - there痴 no voltage at the speaker terminals (J2/J3). The speaker itself tests ok, using a 9v battery check. With the speaker re-hooked up, I ran signal into the amp, fairly cranked - got nothing but the same low hum.

I completely took the circuit boards out and checked all around. Removing all the heat sink covers on the ?transistors - There is no obvious signs of burnt components, neither visual or smell.

If anyone knows this amp and/or can point me in the right direction on how to test through it, I知 much appreciative...