Paolo Marshall JCM 800 2203 mods (Video) 2 discussions This is a work in progress demo of the mods on my JCM 800. So far I've fitted it out with KT77s and done numerous gain and tone mods. It's recorded using a digital camera and is heavily attenuated by .. Tags: Marshall JCM 800 2203 Les Paul KT77 Mullard Brimar Electro Harmonix Metal Rock Slash