I am playing through a Ampeg PF-500 for over a year now. No problems with it at all. I am pushing it through a SVT 410 HLF cab. 4 ohm load also. I also use a BA-115HP Ampeg combo amp with my set up. I use the line out on the PF-500 in to the input of the BA-115HP. I am also using a MXR-10 band eq along with a BBE sonic stome pedal before the amp. My problem started when I started a new band. Both my guitarist play all tubes and and half stacks. My drummer plays a double bass kit with triggers on the kick drums. This set up used to be amazing with my old band. But now that I'm trying to keep up with tube amps I'm not getting the great tone I had by pushing the amps so hard. To get it loud enough to be heard I end up loosing alot of my bottom end. I want a really crisp clean punchy sound. Any suggestions on what to try with my current set up that might help. Also I'm considering going with a Mesa Boogie Big Block 750 to try and accomplish what I'm after. What are yall's thoughts on this. I'm a relatively new bass player and am learning more and more about bass equipment. I'm orginally a guitar player.