6GW8

Triode-Pentode — Noval

Data: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

↗ r-type.org ↗ TDSL ↗ Radiomuseum

Known Equivalents & Substitutes

ECL86CV8297

Similar Tubes (Not Drop-In Compatible)

6F5P

Soviet triode-pentode (6Ф5П) listed as Russian substitute for ECL86 — similar application but verify pin compatibility and characteristics

PCL86

Series-heater equivalent (14.5V/0.3A) — not compatible with 6.3V parallel heater circuits

Electrical Specifications

Section 1 — Triode

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)300V

Anode Dissipation (max)Anode Dissipation (max)0.5W

Cathode Current (max)Cathode Current (max)4mA

Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max)100V

Notes

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

AL860 PCL86

References