ECC31 = 6N7GT

Equivalent ECC31, NR73, VT96, W1280
Similar type  
With different Vf  
CV number 6N7 = CV1285, CV1957
6N7G = CV1956
6N7GT = CV1958
Swedish Mil.nr. 6N7 = M2463-209
6N7G = M2463-210E
6N7GT = M2463-210
Air Min. Ref. 10E/473, 110E/4, 110E/168
Army ZA or ZC ZA5500, ZA16132, ZA17811