Details Marshall Style Plexi/800 Filter Choke. (Direct Replacement for the Marshall® JCM800) Mounting Dimensions : 1 7/16" x 1 3/4" measuring hole centers of four holes Please use caution when referencing these wiring diagrams. Mojo transformers have undergone various changes over the years and these wiring diagrams are meant to aid in the purchasing process and represent current production only. These diagrams may not necessarily correspond to previous models. Mojo is not liable for damage that may result from the use of these diagrams. Please contact us if you are unsure about anything relating to Mojo transformers or if you need to verify data on a specific transformer you have been shipped, especially if you did not purchase the transformer within the past six months.