(!!!) (Recommended GE Pair) JAN-CG-6Y6GT GE NOS 1964 (51ma and 55ma)
(!!!) (Recommended Pair) 6Y6GA Sylvania NOS (48ma and 51ma)
(!!) (#3 6Y6GA Sylvania Pair) 6Y6GA Sylvania NOS 1956-1966 same internal build getter halos different shapes (48.5ma and 49ma)
(!) 6Y6G=VT-168A Raytheon coated glass NOS 1944 (60ma)
6Y6G Arcturus by Tungsol coated glass used/good/70% 1940's (43ma) tested on amplitrex
6Y6G GE 1943 used/good black plate, double filaments, crack in base (56ma) tested on amplitrex
