Metropoulos Forum

Hey guys!

I have been off these forums for a while because I have had no issues with my plexi. But recently I played mine in a venue with an old backline cab. Mains on, everything as usual. When I flicked standby switch, then I heard a loud pop and it blew my HT fuse. Later in the rehearsal room with a decent cab and slo-blow fuse it made a buzzing noise for about 4-6 seconds and the fuse melt.

What are the first stages of troubleshooting this kind of problem? The guts look okay.

Best regards,
Marvin.

Try some new powertubes and see if the same thing happens

Okay.
I pulled the tubes out, no fuse blow. Then I kicked in outer pair and the left one got huge blue thunderstorm all over in it. Then I pulled outer ones and put in the inner ones and the amp works great. I hear a little more shaking noise on this tube than others, so it's obviously a tube problem, right? Now should I get a new quad of power tubes?

Thanks for helping just a guitar player out.