Anyone heard both of these amps so as to know the sonic differences? I've been studying the schematics and there are some distinct changes in the input section and the power section of the Roughneck compared to the Tweed even though it was based on the same circuit. Wondering what those changes add up to as far tone--? I realize the Roughneck transformers are beefier thus allowing the ability to use other power tubes than the 6V6--6L6, KT88, EL34. But I'm trying to compare apples to apples as close as I can so am only thinking about the 6V6-5Y3 combo. Any opinions?