The CV3908 (commercial equivalent is the 6BH6) is a high impedance, medium gain signal amplifier pentode. It has a low heater current requirement and was designed for use in car radio and other mobile equipment.
The anode lead is screened below the bottom mica.
Made in England. The control grid is wound on copper supports.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
