A. Baev. Low frequency amplifier for electric musical instruments * R. Romanov. Modernization of the Record-53 radio receiver * B. Rinsky. Electronic small-sized examination machine * V. Perlov, Four-channel stereo amplifier with sound speakers * V. Dedenok, Children's electronic machine ADE-2 * K. Aladagov. Electronic oscilloscope * L. Redyshna, B. Redkin. Switch of Christmas garlands on a step seeker * V, Babaev. Simple transistor tester * V. Vasiliev. High-quality amplifier LF * For amateurs