Vacuum Tube - 8SN7GTB, Dual Triode
New-Old-Stock (NOS) tube.
The 8SN7GTB is a medium-mu triode intended for use as a combined vertical oscillator and vertical deflection amplifier in 450 mA. series heater operated television receivers. Thermal characteristics of the heater are controlled such that heater voltage surges during the warm-up cycle are minimized provided it is used with other types which are similarly controlled.