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B-52 AT-100 Half Stack Amplifier?
I have a half stack that I bought a while back from a guy on craigslist. He showed it worked to me, by playing it when I went to pick it up. I noticed though after I got home and play it for a few minutes the volume just gets cut down to almost nothing where I can hear crackling and static and barely hear the guitar. I then have to crank the amp volume all the way up almost, then just hit the strings on the guitar and then the volume kicks back in. What could cause this? It happens in all three rectifier modes, meaning I can switch the mode when the volume cuts down like that, and switching the rectifier to either of the other modes doesn't make it come back. I just have to crank the volume up and scare the bejesus out of myself and anyone within a football field for the sound to come back like it's suppose to be. Any help?
3 Answers
- 6 years ago
make sure the volume on the guitar is all the way to 10 and that the cable you are using is in good shape. At 100 watts you're going to be loud at 1. Its going to be loud pretty much any way you play it. Sometimes there is a 3 setting switch that can cut the output half way or a quarter down for practicing. You really shouldn't use a half stack to practice anyways its better to just have a combo amp and use the stack for shows/Jam sessions. It sounds like its an input issue to me but I don't know for sure without looking at it
- ?Lv 76 years ago
That is a common sign of a loose tube. With the amplifier cold and unplugged, pull and re-seat all tubes one a a time. Don't overlook the possibility that one of the tubes, likely a 12AX7 in the preamp stage, may have been mechanically weak and is coming apart internally. While I don't have a schematic on the AT-100, your likely culprit tube would be one of the 12AX7's, which is a very common tube (often sold as the ECC83) to this day and it sure won't hurt to have a spare.
