Thanks, that's great advice. I have never found a head that I like more than this one, or sounds like this one... The sound is so exactly what I want from a head, it's like it was made for me. I haven't seen another one since as long as I could remember, so it's not like I could run out and get another ss-150 from somewhere, and if I could, the person selling it would probably be asking a good amount for it. Anyway, I will be much more diligent with the Ampeg folks to make sure I get quality service and a good understanding of what part is going bad and why. It's worth it. I'll let ya know how it goes if you're interested...