UF86

Name: UF86
Brand: Philips

Small Signal Pentode — Noval — Philips

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

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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

EF86

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

PF86

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

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

25DK3 6J32P AL860 EF806S EF86 PF86

References

https://frank.pocnet.net/sheets/030/u/UF86.pdf