I have a Woo Audio 2 and I love the sound of it. The only drawback is it uses some tubes (6Z4) that are very hard to find - damn near impossible in North America. I digress. How does this amp compare to other amps in the 1000 to 2500 range? Would I notice a big difference if I upgraded? Your...

I am looking for a high-end portable amp. Long battery life would be good but not mandatory. I have looked at the RS - SR-71 and the XP-7, AE-1, Porta Carda Prehead and the headroom Mcro Amp with the desktop module. I am a neophyte and would really appreciate your help. I have about 1200. to...