I had a great conversation with Scotty at Proanalog last night (I'm buying a Proanalog MK II... will let you hear some clips after I get it). Scotty was telling me about Jimmy Page, and the Heartbreaker tone... Scotty says he used a Telecaster into a Vox Tonebender MK II into (get this) a Rickenbacker Transonic 200 (not a Plexi). Unbelievable! Check this out (look at the bottom of the page):
Classic... trippy! Looks like a robot from The Day The Earth Stood Still.
The MKII I'm getting is an excruciatingly correct re-make of the Vox Tonebender MK II. The Fulltone Soulbender (which I have and like) is a re-make of the Vox Tonebender MK III, and sounds smoother. The MK II will have NOS Mullard OC81d transistors. I'm looking forward to it.