Well, between the 65 Amps London, the KT-66 Plexi clone I just purchased, and the 68 50 watt Marshall Plexi (unmodified), the bases are definitely covered, I think. I already know how great these type speakers sound with my 6V6 based amps, so I'm not going to bring mine (or anyone elses) as I figure most folks are using the above amps for their main gigging rigs (now that might be wrong, so don't flame me! LOL), so that's why they were selected. Also because they're probably more familiar with these style amps than single ended Class A amps. Sure, I run my dual 6V6 amp head thru a 2x12 and a 4x12, but I realize I just like the "big sound" that amount of speakers and size of cabinet provide.