12SK7/12SK7GT
	Equivalent VT131, 5661 Similar type   With different Vf 6SK7 CV number 12SK7 = CV543 12SK7GT =  CV544 Swedish Mil.nr. 12SK7 = M2463-160 12SK7GT = M2463-161 Air Min. Ref. 110E/28, 110E/459