Marshall Model #4500, Model #4501, Model #4502, Model #4100, Model #4101 & Model #4102 Dual Reverb Preamp Model4500, 4501, 4502, 4100, 4101, 4102Folders Amp Archives Marshall Schematics & Layouts Amp Schematics JCM 900 ModelsModel #4500, Model #4501, Model #4502, Model #4100, Model #4101 & Model #4102 Dual Reverb Preamp 1Images Leave a Comment Cancel replyYou must be logged in to post a comment.