This is an original manual from Phase Linear. It is from 1979. It is for the 400 Series II Amplifier. Very rare in its original form. It is in mint condition except for the 3 hole punches for a binder made. I haveMANY MORE Phase Linear manuals, brochures, Advertisements, and Reviews on my store. Check them out!-Check out my eCRATER Store for THOUSANDS more Ads, Reviews, and Brochuresrelating to Audio. I have EVERY major audio brand from the last 50 years! Type in any brand name in my SEARCH bar on the left side ofmy Store home page.- I ship Worldwide! Shipping is $3 in USA,$6 elsewhere. -Please email for any questions. Check out my eCRATER Store, ELECTRONICS ARCHIVES, for many more vintage ads!-Shipping discounts are given for additional items, It is $3 for your first item in USA,$6 international, then just $1 for each additional item! -Allthese ads are 100% ORIGINAL! They are from the year they are listed as. We also have a REPRINTS section if you are interested in them.-Satisfaction guaranteed! THANKS! -Greg Powered by eCRATER . List your items fast and easy and manage your active items.