These bulletins have also become know as 'FACTORY MODIFICATIONS'.

We provide you with a complete reproduction set of all of the 3M Factory Sevice Bulletins with complete the details to perform your own factory authorized modifications to your M79 Master Recorder.

These bulletins provide all the details you need including the modification name and what it will do; a complete parts list and location of the parts to add or substitute.

If you want to know what to change to Improve the Frequency Response of your M79 or how to mod your machine to do the 'Fast, One Button Punch-In and Punch-Out...and lots more, then you need this set.

This set includes over 30 Factory Service Bulletins for the 3M M79 Master Recorder.

We also have available a COMPLETE, High Quality reproduction of the entire M79 Operational and Service Manual (see this in the 3M M79 Manual section).