6106 Bendix NOS 1950's rebranded "5Y3WGTA Heintz and Kaufman" in H & K box 1970's double "D" getter halos
1 section) 66/40
1 section) 69/40
6106 is a indirectly heated (slow warmup - 30 seconds) sub for a 5Y3GT
5Y3GT has a directly heated filament