Rig troubleshooting

Seeking input from wiser TBers!

I had an outdoor gig Saturday night and was using my full rig, Ampeg SVT 6PRO and 2 410HE's. Everything was performing beautifully, sounded absolutely great with plenty of volume on tap and sitting great in the stage and FOH mixes, then during a blissful third set I heard a "pop" from the rig and it got...i don't know, perhaps 10% quieter immediately.

I stepped closer to the rig and listened carefully, both during the song and on my own in between tunes, and nothing sounded distressed or distorted though a faint crackling was present which eventually went away. We finished the gig and packed up, and this evening I an going to try and debug to at least see if I can isolate issue to the head or one of the drivers before taking it to a tech.

Does this sound consistent with any other maintenance issues that happen to amps? I use no effects and the amp rubs with the gain set very high and master at about 25% (or 9 o'clock on the dial). I never have any need for higher volume than that.

It sounds like it is tech time but I want to make sure I am bringing in the right component to be serviced.

Thanks!

 

Thanks, I love this head too. Haven't developed the balls to plunge financially into an all tube model and this thing sounds closest to the real deal for me.

It may well be a preamp tube. I haven't had a rig with lots of preamp tubes like this thing does, so it may be time to service them.

I do know that if I have the master cranked and gain set low, the amp is pretty noisy/crackly, so whatever component is responsible for that may be getting worse?

Will troubleshoot tonight to rule out any speaker related issues, then she's going to have to get in to a tech I think. We have a break the next couple of weeks so hopefully I can slide by without a loaner.

 

Hands down my favorite knob! It's usually held at a bit under noon for ample "squish" but occasionally gets cranked when I need more bite.