Hello - I have 2 "Principles of Operation" and 1 "Maintenance Instruction" manuals. Free for the cost of shipping. These manuals cover models CT-4964, CT-6644, CT-7484. john -- *********************************************************************** * John Ott * Email: jott(a)saturn.ee.nd.edu * * Dept. Electrical Engineering * * * 275 Fitzpatrick Hall * * * University of Notre Dame * Phone: (219) 631-7752 * * Notre Dame, IN 46556 USA * * ***********************************************************************