Triode section Rg1 max is 1 MOhm; pentode section Rg1 max is 0.5 MOhm (fixed bias) or 1 MOhm (cathode bias, typical).
PCL86 (14GW8) is the series-heater equivalent (14.5V/0.3A heater) — not pin-compatible without heater circuit changes.
Inter-electrode capacitance between triode grid and pentode plate can be reduced below 0.002 pF using a shielding ring (22.5 mm diameter, 15 mm height).
Pentode mu of 21 is measured from grid No.1 to grid No.2, not grid-to-anode.
Pin Layout — Noval
1Triode Grid
2Triode Cathode
3Pentode Screen Grid (G2)
Socket-Compatible Tubes ⚠ Not electrically compatible