Check the listing for details. GI-21B/ GI21B HF GENERATOR TRIODE TUBE NOS in BOX /OTK/RHOMBUS / QTY-20. Condition: New. Listed at 125.00 USD. GI-21B G21B RUSSIAN HF GENERATOR TRIODE TUBES NEW IN BOX LOT OF 20 Pcs. OTK (quality control) passed. Manufactured in 1973-1975 Military equipment, high reliability. NameGI21BTypepulse triodeCathode typeoxide, indirect heatingApplication fieldoscillation and amplification RF in UHF band in continous and pulse anode modulation modeBrief applicationoscillation, amplificationEnvelopemetal-ceramicCooling methodforced airDimensions88mmx57.5mmMass120gFilament voltage12,6VFilament current0,83 - 0.93Anormal anode voltage0,6kVMutual conductance23 to 31mA/VOutput power110WMaximum anode voltage0,8kV/5kV in pulseMaximum operating frequency9,5cm Please allow for the following shipping times:EU countries: 5-8 business days, on rare occasions a few days more USA: 10-15 business days, on rare occasions more South East Asia (Japan, Singapore, S. Korea, Hong Kong, Taiwan etc) 10 business days, on rare occasions more India, China, Russia, Kazakhstan, Pakistan, Indonesia, Malaysia, Thailand, Australia, South Africa etc: at least 15 business days, but frequently around 25 business days Please note that shipping cost is calculated at average. If you have any objections please contact me for a specific quotation.