Mesa Boogie Dual Caliber DC3 Tube Amplifier Circuit Diagram  Contains electronic diagram and parts values. Good tool for troubleshooting and repair This diagram has the following sections: Block diagram Power supplies Preamp, section 1 and 2 Power amp Switching Diagram is in form of electronic file, PDF format, black and white, 7 pages, size - 205 Kb After purchase, please send me  email address where to send diagram file Please check your email later (Inbox and Spam folders) and download diagram file. Estimated time to email file: 1-10 hours. *****************