– Very Good overall, minor wear. Please see all photos, thanks. This is an original Tektronix Instruction Manual for the Type 581A Oscilloscope. Published in 1963 with new material in 1966, this manual is an essential resource for operation, maintenance, calibration, and repair of the Tektronix 581A. It includes detailed sections on characteristics, operating instructions, circuit description, maintenance procedures, calibration, electrical and mechanical parts lists, and comprehensive diagrams. The manual features a durable spiral binding and tabbed sections for easy navigation. A must-have for collectors, technicians, and anyone working with vintage Tektronix test equipment.