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Question:

2 Channel amp one channel not working. What can it be?

Hello,I am having a home audio problem. I got an amp for free (Tanderg TR-2080) along with 2 BW speakers. I wired it up and worked great for over a year. Then all of a sudden the LH channel suddenly stops working. Thinking it is a disconnected wire, I switch channels and now its the RH side not working. Is there something I should look at, first and foremost? I think the amp is kind of cheap but its in my garage for working on cars. I would like to get both channels running but I don't want to spend $$$ to get it repaired. Any ideas?

Answer:

There is a slight chance it might be as simple as a blown fuse. Depending on the design of the amp, there may be a fuse for each channel of the amplifier. They would be located on the back of the unit close to the power cord. If not there, take the cover off of the amp and look inside. Remember to unplug the amp before performing work on it! They would be the cylindrical style fuses.
slim chance but check to see if channel bridge switch accidentally was turned on.
I doubt the fuse theory, because it would probably take both channels out. You MAY have internal speaker fuses, which you can look for. I didn't get a good sense that you isolated what component is out of whack well enough. You need to exchange the incoming cables (only) to the amp first. Does the problem switch sides? If so, it is not the amp. If it stays the same, switch speaker wires. Does the problem switch sides too? Then it is the amp. If you do both sets, then the problem will almost always switch channels on you, which proves nothing. If the amp is bad: Unless you know electronics, and/or can find a blown speaker fuse, it is going to be tough to find the answer. Incidentally, if you find a blown speaker fuse, do not exceed the rating, and if a new one blows immediately, do not try to solve by replacing the fuse again and again. That can burn up the amp. Good luck!

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