This is an amazing upgrade to the already famous Twin Reverb. This was a D-Style upgrade by Erso Amplification. It expands upon what was already great about the Twin Reverb and takes it even more into that sweetspot. The vibrato channel basically keeps the magic of the original design but adds some better clarity and response, especially in the midrange. The Normal channel was modded to be more like a hot D-Style Tweed channel that is mean for getting really nasty and overdriven. The power section was also stiffened up in a D-Style fashion to give it more of that famous response in the power section that we love.