been using a 1 spot for years now without issue. but recently, my amp had kinda been fading in and out a little; sounded like i was going from a 12" speaker to an 8" or 10" and then it would come back. it would also make a spring reverb crash kinda noise when it went on or off stand by. i thought the tubes might be it so i changed all of those and when i brought the pedals back in the weirdness came back. only powering two pedals and a tuner at the moment, a third pedal has its own power supply. straight into the amp, no loop. the amp seems a little noisier and hum-ier than usual, even after the tube swap, even with no pedals in the chain. this is all new to me. thoughts? could it be the power supply, or a pedal acting up? should i get a bunch of 9 volts and figure this out?