EL90 Haltron (6AQ5 / 6005 / 6669)
The EL90 is a small audio output beam tetrode valve capable of 4.5 Watts in a single-ended configuration. The EL90 design is the classic 6V6 squeezed into the tiny B7G envelope. The small size means that the valve runs very hot. The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 60 mm long.