Source:Tektronix, UK (1979)
Tek Instruction Manual, Part No. 070-2899-00 Product Group 24, Models: 1420 NTSC, 1421 PAL, 1422 PAL-M, Vectorscope (SN B050000 and up). This blue notebook includes sections on installation, theory of operation and service information. The manual also includes a block diagram, schematics and photographs.