A few weeks ago I bought a JCM 800 4212 combo. It had a few problems so I took it right back to the shop to have it retubed with EL34's and cheked out. Anyway, I got the amp back yesterday and I noticed it sounds horrible at bedroom level. I cranked it up for a few minutes (before the neighbors could complain)and it was a totally different beast. It's got a master volume, so I figured it should have the same great tone at any volume. Do Marshall's have to be played loud to sound good?