6AC7

Equivalent 1852, CG64-H, REL39, REL41, VT112, ZA6053, ZA19740
Similar type  
With different Vf  
CV number CV478, CV660, CV747, CV846, CV849, CV1876, CV3973
Swedish Mil.nr. M2463-060
Tektronix part no 154-0011-00
Hewlett-Packard part no. 1923-0014
Air Min. Ref. 10E/334, 110E/55, 110E/85,
110E/722