I hadn't used my TRRI for a few years when I had it serviced about 2 months back. Guy put in a set of ruby power tubes, all 4. I used to run it with 2 an I swear the amp was so much smoother and more natural. No matter which guitar I use it with, an SG classic, a Tele, even something with humbuckers, the amp just sounds "fizzy" and ear splitting with any overdrive pedals. It used to be very pleasing to the ear, but now it seems I can't wrestle a good sound out of it at any setting. So, anyone have any tube suggestions? I'm half considering buying an old high power twin clone kit, but new tubes would certainly be less effort and expense . I've heard of some guys changing out the phase inverter tube to a 12aU7 or 12aT7. What else have people done with good results?