Amp problems

Is there bias adjustment on the amp or does it have auto bias? If auto bias the tubes may not be matched.

One of the four tubes in my amp went out of bias, the amp made a loud noise, faded in and out, and the tube had a meltdown. Check the tubes and make sure they are properly biased.

Backstory: this was starting to happen before my new tubes, that is why I got some new tubes. That’s the advice I got from the music board.

Update: this morning I tried my amp again, still crackling. I gave it a couple good hard strums on my guitar and the he sound came back like nothing happen.

Could it still be the bias? Bought the egnator cab and blackstar cab for 400 dollars. Instead of investing more money to get this one fixed, should I just suck it up and buy another amp head off of reverb?

The plastic on the tube plays a role. I repurposed an amp last summer, built a new box, the whole 9 yards. I got it all back together, plugged in and was hit with hissing and buzzing. After careful examination I found that the smallest bit of a soldered wire was lightly touching the metal housing of the amp, so I clipped it and problem solved. I say all of that to say anything in your amp that’s touching something it’s not supposed to will cause amp issues. Your problem more than likely lies in the broken plastic or something touching something it’s not supposed to.

Just because modern tubes are brand new and appear fine doesn't mean they are, modern stuff is pretty lame quality, durability and longetivity wise. And that tube you dropped might look okay electronically but that doesn't mean it is. Roll your tubes, using old and new if need be, until you narrow down the problem glass and can purge it from the lot. That will at least eliminate or confirm the glass as the culprit(s).