Hi Myles,
I haven't posted here a lot lately, but I have been lurking. I was hoping to get a little advice on my amp problem. I have some electronics experience, but admittedly, little with tube amps, so I was hoping you could point me in the right direction.
I have a Fender Hot Rod Deluxe( Schemo here ) that I recently noticed a drop in volume on. Thinking that my power tubes were on there last legs after two years of great service, I made a mental note to get some more.
BUT ... before I did I was playing at a pretty low volume one night, and the volume started decreasing dramatically. As I was coming to grips with this, there was definitely a small crackle coming from the speaker. Before I could get to the stand by switch, there was a small feedback-like sound then, lights out. Hmmmmmmm. Not good.
After procuring some new fuses I put in a know good set of power tubes, and changes the fuses. After warming the amp up and staking it out of standby, I get that low volume feedback sound for about a second, then the fuse blows. (whooooot, pop.)
I'm thinking with the fuse blowing so fast I should be looking at the power section caps and x-former. No smells, burns or leaks on visual inspection, though I haven't pulled the chassis yet.
Any ideas/advice?
Thanks in advance!