Many of you know how much I love my YBA200, it's outstanding in many ways, size, tone, power etc. But I've been doing a lot of thinking lately and an issue that has bothered me since I bought the amp has really been annoying me and that is this. It seems a little thin. Honestly, it seems thin to me. It's like there's too much treble and high mids that cannot be EQ's out without it sounding mushy and unresponsive. Would different tubes, pre or power, negate this high end thinness in any way? I really like the solid state tones I get from my GK and Peavey BAM, but I love the warmth tubes give me and the different sound I get from them. I also like having a little dirty overdrive in my tone and the tubes afford me this easily and are fairly pleasant but I've found I much prefer my power amp tubes overdriven, it seems to be a much more powerful, heavier distortion. So... should I replace the tubes in this amp and hope for the best or would I be better off selling this amp, which was my intent when I bought it to play it, decide if I like tube amps and then sell it for an SVT or 400+? I just crave a heftier sound with bigger lows, more midrange and less high end. I play it through both a YBX1510, which I'm selling due to downsizing issues, and an Avatar B410 Delta that I love. Any help/thoughts/opinions would be greatly appreciated. Thanks and happy holidays!