This is the BAMA archive. These manuals are available for download and free of charge. Do not be tricked into paying for a manual that is available here for free.
I am now accepting new manuals for inclusion in this archive. Contact and submission information below
GR821.pdf Manual for the General Radio 821-A Twin-T RF Bridge, circa late '30's. At the end of the file are pages from Radio Magazine, Nov 41 describing how to build such a bridge for amateur use. Compliments of T. J. Lindsay, WA9QCW.