Thanks E-man. I am aware how the old tube circuits worked. I just want a detailed schematic of the I40 modules. I tried downloading the two .gif file links provided by Vatorman but they contain no data. I am doing a tear out of an old Otis with an EMO and and about every other type of overlay Otis could throw at this thing until they lost the contract. I might have a couple different uses for the I40 modules. It is just a technical curiosity. Cool, another elevator man musician. I like tube amps mostly because they have the ability to clean up nicely with just a roll of your volume knob. I play through a Hughes Kettner Switchblade.
