Triode 6S33S-V High-Quality Russian audiophile tube. Used in Hi-End audio amplifiers. Designed to work as a regulatory tube in electronic voltage regulators
Russian electron tube G-807 - output beam tetrode. Brown base. Great vintage sound! Analog to the 807 Sylvania, VT-100, QE06/50. Near equivalent: 6BG6G, 1625 and 5933