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  1. Hey guys, I had my first problem out of my DT25 the other day, and it's a good one. I turned it on, flipped the standby switch after it warmed up, got a loud hum from the speakers, then the amp shut off completely after a second or two. Now it doesn't come on at all. No power light, no sounds, pops, tube glow, nothing. The tube protection fuse on the outside is fine (i replaced it just to verify), power cord's fine, tubes are fine (replaced those to verify as well), and speaker is fine. It was plugged into the amp properly too. I haven't had much time to troubleshoot otherwise, but I did pull the chassis for a few minutes. All wires/connections I could see looked good. I didn't see any burn marks on the PCB's or components. The problem feels like something early in the flow of the power section, like a blown fuse or component. I guess i need to break out the multimeter and check some things. Before I do though, are there any other internal fuses, or typical components that fail, that I should check first? I must confess that I've never really dug into the internals of this amp, other than to bias the tubes. It's been super-reliable so far, taking beatings from being lugged around for over a year. For the time being, I've been using my backup amp, a Spider Valve 212 1st gen. I must say, the POD HD500 going into the amp input of it sounds very good. :) It stinks having to lug it through downtown Nashville though, even on a cart. If I can't get the DT25 working again for a decent price, I may search out an SV 112 1st gen to replace it.