Vacuum Tube - 3V4 / DL94, Pentode, Power
New-Old-Stock (NOS) tube.
The 3V4 is a miniature power amplifier pentode designed for use in the power output stage of compact, battery operated equipment. It is particularly useful in three-way portable receivers which employ 90-volta batteries. The filament is center-tapped to permit operation from either a 2.8-volt or 1.4-volt filament supply voltage.