One of these days, I'm going to have to purchase a Bryston pre-amp. I've got a John Curl designed Parasound PHP-850. It has tone control bypass, which I usually use, but occasionally, I'll have a recording that's not terrific and I'll tweak the sound, a little bit, with the tone controls.
I've always wondered how different a Bryston pre-amp or a BP-20 would sound.
One of these days...
HsvHeelFan