Recently, for no particular reason, the left channel on my amp has stopped working. I've checked the speaker cable and the speaker and these are working fine. It a complete mystery and I was hoping some could enlighten me as to why this is happened.
There is no way to know until one examines the unit. A blown fuse is cheap if there is nothing else wrong. On the other hand you could easily get into repairs that equal the cost of a more modern unit.