Yesterday, I bought a pair of el34 Mesa tubes at Guitar Center. I pulled my two outside power tubes, replaced them with these, and when I powered the amp up, my fuse blew and I smelled electrical burn. I replaced these tubes with the 6l6's that were in it originally and also replaced the fuse. The EL34's were blown, just fried. Also, the amp has a hum at "idle" now that it didn't have before, even with humbuckers. What on earth is going on here? Everything in the manual recommended these tubes and said you could just plug and play. My 6L6's have little paint dabs on them; the EL34's did not. When I re-read the manual, it said that 300 series amps have the EL34's on the inner two sockets. Could this have been it? I think I screwed my amp up by changing these tubes, and I'm pissed.