The 8B8 is a multi-unit glass vacuum tube containing a medium-mu triode and a sharp-cutoff pentode housed in a single 9-pin miniature envelope. Designed primarily for television receiver circuitry—frequently utilized in vertical deflection oscillator and amplifier stages or audio output applications—it features an 8.0-volt, 450mA heater designed for series-string tube filament configurations. Manufactured by companies such as RCA, Sylvania, GE, and Tung-Sol, this tube delivers dependable dual-section performance for vintage television chassis restoration and specialized electronics repair.