65-Watt Transmitting Tetrode. The 4-65A aka 8165 is a transmitting tetrode. It can be used with full input up to 150 MHz and plate dissipation is rated at 65 watts. One is used in Kaar FM-179X, two in Gates CMG-1.
Item Tag: 4-65A Vacuum Tube
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1 EIMAC 4-65A Vacuum Tube 65-Watt Transmitting Tetrode URANIUM GLASS See Photos
The product is a vintage EIMAC 4-65A vacuum tube, a transmitting tetrode designed for radio transmitters. Made with uranium glass, this 65-watt tube was manufactured in the United States. The brand Eimac is known for producing high-quality vacuum tubes for various electronics applications, making this particular model a sought-after collectible for vintage audio and video enthusiasts.