Since my SVT has been in the shop I've been stuck using my guitar player's Hartke 2000. Well, last night's show proved that the Hartke isn't a viable backup amp, I was either clipping the amp (at low master volumes) or I couldn't hear myself. So now I am thinking I want a tube amp as a backup for the SVT, but I don't know what my options are. I could get a second SVT, but thats $$$, I could get a V-4B, but will 100W work with a Mesa and JCM on stage? There's also a vintage Sunn, I just don't know what model to look out for. Or I could try to track down a Fender 400PS but they seem rare. Any suggestions what else might work for me?