A few weeks ago I was playing my LSC when it emitted a hum and then died. I checked the fuse and it was shot. I replaced the fuse, removed the power tubes and rectifier tube and turned the amp on. It remained on which meant it was a tube related issue. I breathed a huge sigh of relief! Following the proper procedure I replaced each tube one by one. I was shocked when the amp worked perfectly with all the tubes back in and on every setting.
Earlier this evening, I was playing my LSC when it started to emit that familiar hum. This time, however, I was able to switch the amp to standby. I inspected all the tubes and none of them were hotter or glowing anymore than normal. I turned the amp back on and continued to play. A few minutes later I heard a bit of crackling so I switched the amp from 10W to 50W. The crackling disappeared which should indicate that either an outer power tube or the rectifier tube is the culprit.
I've played the amp almost everyday for the past two weeks without any issues. I even had it on for quite a few hours straight yesterday without incident. What do you think caused the humming and blown fuse?
Earlier this evening, I was playing my LSC when it started to emit that familiar hum. This time, however, I was able to switch the amp to standby. I inspected all the tubes and none of them were hotter or glowing anymore than normal. I turned the amp back on and continued to play. A few minutes later I heard a bit of crackling so I switched the amp from 10W to 50W. The crackling disappeared which should indicate that either an outer power tube or the rectifier tube is the culprit.
I've played the amp almost everyday for the past two weeks without any issues. I even had it on for quite a few hours straight yesterday without incident. What do you think caused the humming and blown fuse?