Having had the good fortune to play extensively through an original JTM 45/100 and countless vintage plexi’s, I have always consider these crown jewels to be the sonic footprint of a generation. I have tweaked the Gold 45/100 as closely as I could to capturing the essential qualities of those amps including the big and just-enough-sag in the low end; the fat mids and just-right top-end. There is plenty of gain to recreate the dimed quality of these amplifiers but accurate enough to not get mushy.
The lean/rich control was designed with a specific goal: when turned fully counter-clockwise in the lean position, it approximates the tone and feel of plugging into the Normal channel of the amp. In the fully clockwise position, it approximates the tone and feel of plugging into the Bright input. Set it in the middle and you approximate the sound of jumpering the inputs!
The Gold 45/100 might just be the last spoonful of tone you need!