(!!!) (Recommended Pair) 6CB5A RCA NOS same date codes same batch (77ma and 78ma)
$ 59.99
1 pair) 6CB5A RCA NOS same date codes - same lot 1970 era
1 tube) 78ma Gm=7500
1 tube) 77ma Gm=7500
Tested on Amplitrex
Vplate=175
Vscreen=175
Vgrid=-30
Iplate = 70-100ma (Good)
Gm = 7,500 - 9,000 (Good)
See more: vacuum tube
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 (Recommended Pair) 6CB5A RCA NOS same date codes same batch (77ma and 78ma) "Pin It")