Hello everyone. I've been reading these forums for a while, ever since I picked up a dirty SX-650 for 35 euro (~40 USD) a couple of months ago. I've no experience working on amps but was hoping to get into the hobby since I love the look and sound of vintage audio gear, so I took my chances. The forum really is full of good information but I'm stuck anyway, so here goes. I thoroughly cleaned the amp and it is looking great now. I inspected it visually and saw no damage, except for the three incandescent bulbs that illuminate the radio dial. They were burnt but that's an easy job. I tested the amp with my headphones and it worked perfectly on all inputs. However, the trouble came when I started hooking up speakers. The speakers themselves are mint, I've verified this multiple times. When I add speakers to the left channel (either A or B), the channel is noticeably low in volume and heavily distorted. This happens with all inputs and even in my headphones. I can listen AUX, phono or FM and it will sound absolutely great until I connect even one speaker to the left channel. I have tried setting the amp to mono but that doesn't solve the problem. I will say that listening on extremely low volume seems to get rid of the distortion. I coughed up ~26 USD for a can of Deoxit D5, but it did not help the issue, unfortunately. I'm sure it will be helpful for other projects. I tried tapping the relay from different directions, that did also not make a difference. I've got a multimeter coming in off Amazon, but I haven't tested anything in that way so far. Any ideas what it could be? Thank you kindly for you help.