We don't need Uwe to make any jokes (though I love his wits) when Randy himself is being funny enough for himself sharing his . Out of curiousity I did some read up on Garnet and its Randy Bachman history quoted by the man himself (which is entertaining if you know the technical side of a tube output stage that is):
Gar and I developed this unit together back in '65-'66. Growing up playing violin, I loved the sustain, especially of a viola or cello. So early on in the mid '60's, I found out that by plugging a small amplifier into a bigger amplifier, I could get this sound. Now I was taking the power out, which normally would go to the speaker and plugging it into the input of another amp. The result, for a few short minutes was a cool, great new sustained sound. Gar Gillies had a tv/radio repair shop, was a cool musician, and I wasn't embarrassed to take in my amps, which were literally burned by the power misuse; fried, to say the least. Gar asked what the heck I was doing, and when I told him, he said, you're insane to do this, its very dangerous. So he offered to help me do it a safer and less destructive way. Gar proceeded to build me a tube pre-amp, which when put into another amp, got me the desired sound.
I've always been struck by the guitar sound of American Woman but never investigated what equipment was involved making it. This makes your project even cooler Jake.