B
bri5150
New member
I have a 5150 III 120watt half stack that I bought when they first came out. The serial # is in the low 400's. Its never left the basement has maybe 100 hours on it. Last week, no sound. Had a look inside and found a few loose screws on the power tube sockets. Also found tube V1 blown. The top of the tube was white. I had a spare used 12AX7 tube and tried it. Amp worked. While I had the case open, I checked the bias. It was FACTORY set at 54! From what I've read, the first batch of heads should be around 15. And the newer one's around 30. How could this be correct? Could that be why I blew that tube? I set the bias to 30. Should I change all the tubes just to be safe? Its been a while since I've used this amp since I picked up a Carol Ann OD3r combo. But the amp sounded very harsh to my ears. Again, the CarolAnn amp is setup for Allman Brothers, SRV, Black Crowes... Not EVH so maybe I'm just not used to it.
What do you think?

What do you think?