Hmmmm, it didnt go terribly......it also didnt go great either.
The only bulb I have is 100W - tried that, its glowing half bright. The relay at the back of the main power supply board clicks in a few seconds later. The powersupply I have then drops from 100V to 70VAC on its meter, so nothing appears to be dragging the voltage right down.
Problem is absolutely no sound. I take it the speaker relays are meant to click depending on speaker selection? Nada there.
The bulb is half glowing bright. I think perhaps there isnt enough current to make the amp work properly? I tried two 60W bulbs in series however Im not sure if that represents a 120W load, or just confirms that I dont really understand electricity that well.......
Tried to set DC offset at speaker terminals however of course, I wouldnt have been getting a proper reading if the speaker relays werent engaged. I also tried to set Bias between the two outside pins pictured. The amount went up and down a bit between say 0 and 13mV, then both sides went down to zero.
I'm going to replace VR 1 and 2 in the power amp boards, then work out where to take the DC offset reading from pre-relay, then try again once the trimmers arrive in a few days.......
Im really not looking forward to having to work on (and take voltage readings) these power amp modules. I havent actually figured out yet how it would be possible to do this - except by running some extended connection leads from the rest of the amplifier to each module? yikes