Offered is the Zenith type 80 Full-Wave Rectifier Tube. The tube is clean and in good condition. It is an early type with Hot-Stamped base graphics. The tube tests good on the EICO dynamic tester and it shows no shorts or inter-element leakage. Production code: HK3. The tube has smooth black plates and a lower getter with excellent silver flashing. This tube has hanging type filaments. There are a few loose particles within the base-the base is firmly attached. Early 1930's vintage. Pick up the OEM tube for your own Zenith radio restoration. NO RESERVE!! Thanks for looking.