EL90 = 6AQ5

Equivalent 6AQ5, 6AQ5L, 6AQ5W, 6005, 6095, BPM04, N727
Similar type  
With different Vf HL90 = 19AQ5
XL90 = 5AQ5
CV number CV1862, CV2883, CV3972, CV4019CV8229,
Swedish Mil.nr. M2462-432,
M2462-456
M2462-540C
Tektronix part no 154-0017-00
154-0283-00
Hewlett-Packard part no. 1923-0018