Date codes mid-late 1970’s. Match within 1 ma anode between individual sides of the two tubes ie, between side 1 of one tube and side 1 of other and side 2 of one tube to side 2 of other (6N3P have two sections).
Date codes mid-late 1970’s. Match within 1 ma anode between individual sides of the two tubes ie, between side 1 of one tube and side 1 of other and side 2 of one tube to side 2 of other (6N3P have two sections).