General descriptionThe output electrovacuum triode - 6?4? serves to increase the power of low-frequency signals in various radio technical devices (amplifiers and generators of electromagnetic oscillations). The design of the radio lamp is distinguished by the presence of two paired triodes, all elements of which (anodes, cathodes, grids) are connected in parallel and placed in a shaped glass bulb with an octane base. The device has been produced since the 1950s, is a direct analogue of the American 6B4G lamp and was developed for Leningrad receivers, as well as for G3-2 generators.Basic technical characteristics• Current in the glow circuit at a voltage of 5.7-6.9 V: 1 A.• Optimal voltage applied to the anode: 250 V.• Anode current in operating mode: 62 mA.• Bias voltage on the control grid: – 45 V.• Maximum power dissipated by the anode: 15 W.• Average signal gain: 4.

RARE 6S4S 6C4C Svetlana BLACK plates Output triode tested Soviet brend - Svetlana lot 2 pcs - NEW NOS SAME DATE Tested 2S4S Triode Tubes .(analog of 2a3 )Plant: Svetlana of extremely rare 2c4c tubes. 2c4c tube is a soviet copy of legendary 2A3 , old manufacturing, amazing sound. Queen of triodes. One of the BEST Soviet tubes. RARE 1964 year! BLACK plates Made in USSR NOS Made in IV, VII-1964, marked OTK .The tube are never used. Military equipment.High reliability. Dear buyer, I will combine shipping if you buy more than one item in different listings, the shipping cost depends on the weight of the package. Approximate shipping cost by weight (note that the weight includes the weight of the package)0-0.250 kg - 8-9 dollars (up to 0.5 kg - 15-16 dollarsup to 1 kg 25-27 dollarsup to 2 kg 35-39 dollarsand each next kilogram plus 15 dollars. Not all radio tubes, indicators and other radio elements that I and my partners have in stock are represented in my store. Write your needs and I will find you what you want to buy at the best prices. I will make a personal lot with the best prices and the best shipping!!! Dear buyer, if you are dissatisfied with the purchase for various reasons, do not rush to leave a negative review, I will always be on your side and decide or compensate your costs, especially since Ebey always returns funds if there is a reason for this !!! Happy shopping!!!