........a power amp with a volume pot fitted or has it got a active pre amp stage? I have always asumed the former but then I read a thread on AudioKarma that said...[QUOTE].....I have bypassed the selector switch and removed the pre amp circuit so it is virtuley a power amp now and it sounds great.....[/QUOTE]. He has the "A" version, the same as lordsummits amp whereas I have the "B", but it still has 2 pre-amp tubes as well as 2 driver tubes. I am toying with the idea of getting a pre amp and using my Ming Da as a power amp but then I came acros the above.... Paul.