(!!) (Recommended Pair) 6AG7Y RCA brown bottom NOS 1958-1964 (27.8ma and 28.8ma)

1 matched pair) 6AG7Y RCA brown bottom NOS 1958-1964

1 tube) 27.8ma Gm=10,800 RCA branded FAA

1 tube) 28.8ma Gm=11,400 RCA

Good mA range 25-32ma

Good Gm range 10,000 – 12,000