Thoughts on BF Pro Reverb I own a 65/6 Pro Reverb. While I like the sound I'm getting, I'm sure there's room for improvement. Does anyone out there know any tubes/tricks/mods that help/change the tone W/O trashing the amp's resale value. I hear that swapping the transformer from a Bassman or the like, tightens up the lows and extends clean headroom...true? Also, the amp has got a couple of speakers in it that I know can't be original. They sound alright, but I'm curious, what speakers did Pros come with and what are some good options for replacement?