845 RF Parts Transmitting Tube. Made in China. The 845 tube has a bayonet mount and thoriated filaments which glow like lightbulbs when powered up. The glass envelope is about 2-5/16" in
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Amazon.com: PSVANE COSSOR 845 Vacuum Tubes Black Bulb Carbon Plate Aluminum Tube Base 6 Months Warranty : Musical Instruments
845 TUBE RCA RADIOTRON MINT MILITARY ARMY TRANSMITTING GRAPHITE PLATE RIBBED AMP | eBay
Japanese Custom made Sanei UV-845 Single E... For Sale | Audiogon