Just as well I'm not paying Yamaha 50 squid a pop for these blown amps. Repaired one end of 2011 , it bounced back. It is due to the short stub lead between amp and its immediate speaker, the elbow connectors. No name elbows on lead marked UPOFC Classic Pro Loudspeaker Cable. Took a bit of grinding to cut the top off the elbow, quite thick monkey metal. The ground connection out to the cable solder point is like a solder tag but with a 2mm x 1mm x tag thickness lug opposite the solder extension ,that locates into the moulded plastic insulator. The tag is not spot welded/bolted to the elbow metal so any twisting of the cable is transfered to the tag and the ring part can twist and touch the conductor stem to the tip, as the cylinder insulation along this stem does not extend into this solder tag, or perhaps as only touching ground contact, then localised heating and the cylinder insulation melting back a bit. I've not explored that far in, the top moulded insulation plastic does not look melted. These elbows have a vague brassy/coppery tinge of plating or something just on the tips , the main elbow body is Hex in plan and between it and the stem is what looks like a hank bush swage-form.
- posted
12 years ago