I have four stompboxes currently sitting on my PS-25 pedalboard/power supply: an Akai tuner and phaser, and a Guyatone chorus and tube distortion. The tube distortion sounds awesome but it needs a 12V power supply; I would prefer not to run it at 9V because I don't want to be changing out tubes on a regular basis. I'm currently running the PS-25 on a 12V supply. My question is, would any of the other effects be damaged by running at a higher supply voltage? I'm not so much worried about the chorus and phaser, which are both analog, as I am about the tuner. I was half-asleep through most of my introductory EE courses in college (prior to switching to economics, obviously ) so I don't remember if digital circuits are especially friendly with higher-than-normal supply voltages.