6AQ5
The 6AQ5 (European equivalent EL90) is a beam pentode with a miniature B7G 7-pin base, designed for audio power amplifiers and TV vertical deflection amplifiers.
Although the 6AQ5 is smaller than the 6V6, it is designed to have similar performance except that the 6V6 has higher maximum plate dissipation.
Tek part number: 154-0017-00