HEATHKIT Set-of-Four Stereo Component Instruction Manual Books (Tube Amplifier, Phonograph, Radio Tuner and Stereo Speakers) being offered for sale. Similar-looking booklets, all from the same series, these. Black & white guides (with removable circuity charts) are for home electronics students / hobbiests and these kits (and subsequent products) were considered some of the best. Remain in excellent, all-original condition. See additional text included above and inspect all p. Ictures as they are also considered part of the description.