(!!!!!) (Recommended Pair) E80CF=7643 Valvo branded Philips Miniwatt SQ NOS 1963 (PREMIUM 6BL8 SUB) (Tuners)

1 matched pair) E80CF=7643 Valvo branded Philips Miniwatt SQ NOS 1963 (Triode/Pentode) 1-3% matched in white boxes

1 tube) 11.3ma Gm=4600 and 9.5ma Gm=6300

1 tube) 11.6ma Gm=4600 and 10.4ma Gm=6000

Good Triode section Ma and Gm = 11-13ma Gm= 4500-5000

Good Pentode section Ma and Gm = 9-11ma Gm = 6000-6500

7643=E80CF is a “”SPECIAL QUALITY”” low noise medium-mu triode/pentode

Specs are similar to 6BL8=ECF80

– McIntosh MR-67 tuner