Hi Max, I'm new to the AK forum and discovered your Youtube page also. I was watching your BGW 100 repair and I'm wondering about how the light bulb is used in your final testing. I'm guessing it's working as a buffer of some sort but have no idea how that would be wired in. I've just finished cleaning up a Phase Linear 400 and with their reputation I don't really want to fry my speakers when I fire it up for the first time. If you could offer some suggestions or direction, I'd certainly appreciate it. I do have a post running with the PL 400 clean up. Thanks a million!