Tetrode GU-43A (ГУ-43A) was designed to generate HF oscillations and signal amplification with output power 1,6 kW at frequencies up to 100 MHz in radio-electronic equipment. It is basically water cooled version of the GU-43B tube. New old stock tubes, directly from the old reservs. Weight: approximately 0,6 kg. Made in the 80's and early 90's.