I had a conversation with a seasoned pro muso a few days ago. We talked about vintage amps, and i brought up the 'vintage non-master volume amp volume thing'. He told me (bloke now well into his 50's), i have to remember that an AC30 is sooo loud (or just as loud as a Plexi) because it is basically "three amps in one". HUH ? WUT ? Can anyone see where he might have gone with this type of statement ? Is there truth in this ? . . . i.e. did he just express him self incorrectly or is that just plain BS with zero understanding of amp circuits ? I did not go any further into the subjet. I just said somehting like, "oh, OK, i did not know that", walked away and looked for the strongest coffee i could find. i was in a coffee shop at the time. So, please help me to understand what he was trying to "educate" me in ! Because i am 100% confused now . . .