Russian directly heated universal pentode 2J27L (2Ж27Л) was designed for HF voltage amplification up to 120 MHz in battery powered equipment. It was developed alongside the 4P1L after second world war. This pentode operates in any position. It is a small tube in aluminum shield. For better manipulation there is a small black bakelite handle on the top. New in box tubes, made in the 60's.