I have a mint condition 5150 212 combo, the only upgrades it has are jj tesla tubes, I recently went to go plug in and play and the standby switch will not light up, checked all the tubes are warming and i even swapped out the tubes to no avail. The amp did sit without being powered up for aprox a month. the fuse is fine as well, any help would be great.
It could be a lot of things.
Submitted by tattoo on February 7, 2010 - 22:47.It could be a lot of things. I would take the amp back where you bought it especially if it's still under warranty.