Hello,
I'm working on a Yamaha A-1 and I need to find out the correct transistor for TR139 or TR140. I couldn't find the part number on the schematic or in the parts list. This amp has had both channels worked on in the past and looks like TR139 and TR140 were both replaced at some point, but may have been replaced by subs. (They are not the same) One may have been replaced with an original, but I can't tell which part number is the correct one. If someone wants to tell me a good current sub that would work, I'd be game for that also. I just like channels to have matching parts. Thanks in advance.
I'm working on a Yamaha A-1 and I need to find out the correct transistor for TR139 or TR140. I couldn't find the part number on the schematic or in the parts list. This amp has had both channels worked on in the past and looks like TR139 and TR140 were both replaced at some point, but may have been replaced by subs. (They are not the same) One may have been replaced with an original, but I can't tell which part number is the correct one. If someone wants to tell me a good current sub that would work, I'd be game for that also. I just like channels to have matching parts. Thanks in advance.