(!!) (Recommended Pair) 1619 RCA NOS 1952 – 1960”s (52ma and 53.6ma)

1 pair) 1619 RCA NOS 1952 – 1960”s

1 tube) 53.6ma Gm=4720 (small amount of rust on metal can)

1 tube) 52.0ma Gm=4750

2.5 Volt filament

15 watts