UF86

Small Signal Pentode — Noval

Philips

Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Similar Tubes (Not Drop-In Compatible)

6267

American designation of EF86 — 6.3 V parallel heater, not series-string compatible

Identical electricals but 6.3 V parallel heater — not a drop-in in series-string heater circuits

300 mA series-heater variant (4.5 V) — different heater series, not interchangeable

Electrical Specifications

Section 1 — Pentode

Absolute Maximum

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

Screen Voltage (max)Screen Voltage (max)200V

Anode Dissipation (max)Anode Dissipation (max)1W

Screen Dissipation (max)Screen Dissipation (max)0.2W

Cathode Current (max)Cathode Current (max)

Section 2 — Triode Strapped

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)200V

Anode Dissipation (max)Anode Dissipation (max)1W

Cathode Current (max)Cathode Current (max)6mA

Typical Operating

Anode ResistanceAnode Resistance16,500Ω

Heater

Heater VoltageHeater Voltage12.6V

Heater CurrentHeater Current0.1A

Notes

Series-heater (100 mA) version of the EF86. Electrically identical sections — only the heater voltage/current differs (12.6 V at 100 mA vs 6.3 V at 200 mA).
Pins 1 and 7 are internal metallic shields for hum and noise reduction — must be grounded for lowest noise performance.
Pin 2 (g3/suppressor) is internally connected to cathode; separate pin allows external connection if needed.
Vhk_max is asymmetric: 100 V (cathode positive of heater) / 50 V (cathode negative of heater).
Rg_max depends on anode dissipation: 10 MΩ for Wa < 0.2 W, 3 MΩ for Wa > 0.2 W.
Brans Vademecum lists DF650 and V453 as equivalents.

Pin Layout — Noval

1Screen Grid

2Internal Shield

3Cathode

Socket-Compatible Tubes ⚠ Not electrically compatible

References