Matsickma, thanks! I don't have a Thunderstar bass amp or Maverick bass amp, and to clarify actually, my Thunderbass 1 is not missing any knobs. Also I traded my Thunderstar to Default (and sold him 66-J & 98-RT), so only the Thunderbass and Mav reamin from the Guild amp collection, I am back to just being one single knob short-on the Maverick- but that amp is far from completely original- it is clean and well maintained, just not a collector piece per say...had I landed the "parts Superstar" that would have helped (now Defualts) Thunderstar...next time something like that surfaces, ill land it.