The 6Z1P is the English translation of the Cyrillic 6Ж1Л of this Russian version of the EF95 low noise VHF RF voltage amplifying pentode. The American equivalent is the 6AK5.
The quoted noise factor for the EF95 at 180 MHz is 3.5.
The OTK logo indicates a valves made for military equipment.
The anode box is partly open at the side revealing three wire grids.
The Cyrillic identification.
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins measures 38 mm tall.
