Vintage Fischer Chicago High-Power Vacuum Tube T89 / 318 Transmitting Triode

Vintage Fischer Chicago High-Power Vacuum Tube T89 / 318 Transmitting Triode Measures approx 8.5” long and 2” wide on bottom UNTESTED, sold AS-IS FOR PARTS. Condition: Tube is clean with intact glass envelope and visible internal markings “T89” and “318.” Getter flash remains, pins show light oxidation from age & a tiny chip on base. Box present with some shelf wear. Normal scratching/scuffing on metal. Rare vintage Fischer Chicago vacuum tube marked T89 / 318, likely a transmitting triode used in diathermy or RF applications. Large 4-pin base with top cap, housed in original Fischer box. Collectible mid-20th century industrial electronics component for radio, medical, or restoration enthusiasts.