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Yamaha Original Service Manual Booklet for the HP-50A Orthodynamic System Headphones.

This is a very good condition vintage original Yamaha service manual for the Yamaha HP-50A Orthodynamic System Headphones. This service manual has specs, parts / exploded views and diaphragm and other assembly replacement. This is a nice brief vintage booklet from Yamaha, printed in Japan, from 1978! It would be very useful if you have a set of these great headphones to repair, and it's a nice collectable as well!

• This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Thank you so much for looking! 

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