Ha ha! I've had a tube fire as well. It is quite spectacular, particularly if you have company when it happens. No problem. It MAY be (as it was in my case) bad connection with tube sockets (although my fire was not inside the tube.) Clean the pins (may as well replace that tube), and if necessary, use a toothpick or something to tighten the connections (I know--I'll be reviled--but my tube stuff is not high-end enough to make it untouchable). If the connections are bad, you will probably hear occasional static, and if you don't act, a full-on fire is the next step. Biasing looks like it should be easy with that amp; just google it.
Tube Fire What Next?
I have a melody el34 integrated amp. I truthfully don’t know much about how to maintain it. About a year ago I had a well respected tech do some work on it and put in new tubes. Last night the family was listening to music and it looked like there was fire inside of one of the power tubes. Scared the crap out of my daughter. I turned off the power and unplugged it. I assume I need to replace the tube. Is there anything else I should do? I have never biased the amp myself but I did just buy a multimeter which ironically just came this week. Can someone walk me through this so I don’t bust my amp or more tubes. Thanks for the help.