GU-47B Power Tetrode. The GU-47B is 7kW Linear SSB POWER TETRODE.Made in Poljaron factory, Lvov Ukraina, ex USSR. Use in SSB Power amplification up to 70MHz. GENERALCathode: tugsten,carbidized,direct heatingEnvelope:heating glass-to-metall,with ring leads of cathode and grids Cooling: forced air.Filament voltage: 6,3VFilament current: 57-67AAnode voltage: 3.0-6.0kVGrid2 voltage: 0.9kVMutual conductance: 36-44mA/V Height: 260 mm Diameter: at most 124 mm Mass: at most 3,5 kg 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.I can combine shipments to save you money! Please look at my other listings!