When i play my Hot Rod deluxe louder than about 1. It crackles LOADS and drops in and out of volume, could this be a tube problem? The tubes are sort of old, but its been getting worse recently, it makes the amp unplayable at any volume that isnt whisperingly quiet.

I'm guessing its a tube problem...
Sounds like a tube issue, try that and if it doesn't work take it to a tech, but if you've had it long enough for the warrenty to go out, you most likely need new tubes.
apparently UG's only type O-

Quote by Strike9

Thanks jb_designs.