E80CF=7643 Philips Miniwatt SQ Germany "PINCHED WAIST" used/good 1961 (11.4/10.4mA) (6BL8 sub)

1 tube) E80CF=7643 Philips Miniwatt SQ Germany "PINCHED WAIST" used/good 1961 (BG2-D1F3=1961) (Triode/Pentode)

triode) 11.4ma Gm=4000 

pentode) 10.4ma Gm=6250 (strong)

Good Triode section Ma and Gm = 10-13ma Gm= 4500-5000

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



(The E80CF is a "SPECIAL QUALITY" medium-mu triode/pentode. Specs are similar to 6BL8=ECF80)

- McIntosh MR-67 tuner