(!!!) (Best Pair) 12BY7A GE NOS 1970 (35ma and 35.5ma)

1 pair) 12BY7A Sylvania NOS 1960's

1 tube) 35.0ma Gm=14,800

1 tube) 35.5ma Gm=15,000

Tested on Amplitrex AT1000

Vplate=250V

Vscreen=180V

Iplate Ma (good) = 26ma

Gm = 11,000-13,000

Heathkit DX-35 1950's
Kenwood TS-830S Transceiver
Kenwood 520
Kenwood TS-20
Yaesu FT-101 Transceiver

- 12BV7 is a close substitute