amp blowing fuse

Powered up my tube amp this a:m and almost immediately the fuse blew. It happened so quickly I don’t even think any voltage was reaching the tubes Put the fuse from the other mono in and got the same result. Going to buy some more fuses now and my question is could a bad power tube cause this? Or does it seem there’s some other internal issue ? The tubes are brand new so I don’t think that’s the case but I guess it’s always possible The amps have been in hibernation for almost two years

metman03-15-2019 2:32pm

metman OP Details Discussions Posts This discussion Message User 233 posts 03-15-2019 at 04:06pm Copy Comment URL Report Comment Edit Delete Very strange. Just picked up some fuses at Lowe’s and swapped the tubes from the amp that powered up and now it powered up. So I’m thinking it was the tubes. So just for the heck of it I put what I thought were the offending tubes in the other amp and that powered up as well. I’m thinking that the shorting jumper was loose on the one speaker and tightened that up. Could that have been the issue. Thanks for all who chimed in. Now I’m out $2.00 for fuses LOL
metman OP Details Discussions Posts This discussion Message User 233 posts 03-15-2019 at 03:19pm Copy Comment URL Report Comment Edit Delete There’s only one fuse externally on the amp. Pretty sure it’s for the tubes. There’s a jewel power indicator lamp that glows for about one second before the fuse blows. I’m not hearing any noise through the speakers when this happens. You’re saying I should disconnect the speaker wires while experimenting? I thought that was bad don’t the amps want to see a load? There’s also a 6sny7 tube. Could that also cause this?
metman OP Details Discussions Posts This discussion Message User 233 posts 03-15-2019 at 05:56pm Copy Comment URL Report Comment Edit Delete Just an update, Problem was a bad rectifier tube swapped it out and all seems well. now breaking in my new Tung soul 7581 tubes