This is an all-in-one package for Hafler XL-280 owners. The set includes an instruction manual, schematics, and a parts list that will provide a comprehensive guide to using and repairing the amplifier. The package is suitable for vintage electronics enthusiasts and collectors who want to maintain their Hafler XL-280 amplifier. The manual has everything you need to know about the amplifier, from the essential features, specifications, and operation procedures. The schematics provide a detailed schematic diagram, which will help in repairing any faulty parts of the amplifier. Finally, the parts list will help you identify and order any damaged or missing parts, making it easy to get your Hafler XL-280 amplifier up and running.