(!) (PAIR) 12HG7=12GN7A Sylvania branded RCA coated glass NOS (37ma and 40ma)

1 pair) 12HG7=12GN7A Sylvania branded RCA coated glass NOS 1970's

1 tube) 37ma Gm=29,000

1 tube) 40ma Gm=30,000

(12HG7=ruggedized frame-grid version of 12BY7A, uprated to 10 watts)

Pentode