I have a 5150 II and lately i have noticed that sometimes the output level decreases suddenly. I originally thought that it was time to replace the tubes, which I did. The amp was working well until today, a week after replacing tubes, in which the problem resurfaced. If I get aggressive with my picking, occasionally the amp returns to normal. Usually, the amp works perfectly, but sporadically I have the aforementioned problem. Any ideas how to correct the problem would be great.
You replaced both the pre and power amp tubes?
yea both preamp and power amp tubes were replaced
I had a similar problem with my old Peavey VTM 60 recently. With mine it would play fine for a few minutes and the volume would go down drastically with some static and maybe a pop or 2. With mine it was a loose connection among the pc boards. There's a few things you can try. First I'd take the tubes out and clean them with TV Tuner cleaner. Stuff you can find at a local radio shack. Spray the contacts a bit and insert them into the socket. Don't spray too much just enough for them to be covered. Then pull them out and repeat a few times. Do that with the power tubes and preamp. That might fix things. If not you probably have a faulty component somewhere or connection. I'd try the tube cleaning first. If that doesn't work take it to a tech or take it apart if you have some electronic experience.
alright thanks i will try the tv tuner cleaner and see if that helps
yea thanks for the help bullseyestrat, but the electronic cleaner didnt do the trick. looks like i will be broke for the next year fixing this fricking amp