Check the listing for details. GI7B / GI-7B HF-VHF-UHF POWER COAXIAL TRIODE TUBES NOS OTK/RHOMBUS/ QTY-4. Condition: New. Listed at 110.00 USD. GI7B / GI-7B HF-VHF-UHF POWER COAXIAL TRIODE TUBES NOS LOT OF 4 Pcs. Military equipment, "OTK", high reliability. Military quality check passed (rhombus) The tubes are never used. Old stock. The GI-7B (GI-70B) microwave triode operates as an oscillator and an amplifier in continuous-wave or pulsed mode with anode modulation in the centimetric and decimetric wavelength ranges. The GI-7B with a heat sink and the GI-70B with no heat sink. The tubes GI6b, GI7b, GI7bt, GI70b and GI70bt are all the same GI7b. GI7b and GI7bt are completed by factory with coolers(HgAl) and the others (#70) without. 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.