6SK7
	Equivalent VT117 Similar type   With different Vf 12SK7 CV number 6SK7 = CV1981 6SK7GT = CV1982 Swedish Mil.nr. 6SK7 = M2463-225 6SK7GT = M2463-226 Air Min. Ref. 10E/343, 110E/11 Army ZA or ZC ZA3442