ECF80 = 6BL8

Equivalent 6BL8, E80CF, 7643
Similar type  
With different Vf LCF80 = 6LN8
PCF80 = 9A8
UCF80 = 27BL8
XCF80 = 4BL8
CV number CV5215
Swedish Mil.nr. M2462-546
Tektronix part no 154-0278-00
Hewlett-Packard part no. 1933-0008