ECC81

Equivalent 12AT7, B152, B309, E1633
6060, 6201, 6679, 7728
Similar type  
With different Vf  
CV number CV455, CV456, CV2016, CV4033, CV5763, CV8154, CV9859, CV10662
Swedish Mil.nr. M2462-415
Tektronix part no 154-0039-0x
154-0205-00
Hewlett-Packard part no. 1932-0027