The GU-46 generate tube pentode, transmitting. Amplifier of high-frequency oscillations at frequencies up to 60 MHz. Equivalent to the: QB5, 1750 tube.
TG3-0.1/1.3 Thyratrone Tube. Low-power fast-acting thyratron tube with the xenon filling. A cathode is an oxide, indirect incandescence. Equivalent ~ 2D21 / 5727 / PL21.
Triode 6S33S High-Quality Russian audiophile tube. Used in Hi-End audio amplifiers. Designed to work as a regulatory tube in electronic voltage regulators