Yo Boogie Board! I have an issue with my old Rev G Triple Rec. It is making a buzzing noise through the speakers, even when there is nothing plugged into the head. I've tried different speaker cables, different outlets, and new preamp tubes that I had for my Dual. I haven't been able to try new power tubes and I don't want to drop the $130 unless I'm pretty sure it's the power tubes. I normally only use the modern high gain channel so I never really noticed the noise until I recently tried messing with the clean channel and realized it was super buzzy. The tubes haven't been changed for quite some time. What do you guys think?