XF94

Small Signal Pentode — B7G

Mullard

Known Equivalents & Substitutes

3AU6

Similar Tubes (Not Drop-In Compatible)

6AU6

American designation of EF94 — 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

150 mA series-heater variant (12.6 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)300V

Anode Dissipation (max)Anode Dissipation (max)3.2W

Screen Dissipation (max)Screen Dissipation (max)0.65W

Cathode Current (max)Cathode Current (max)

Notes

Series-heater (600 mA) version of the EF94/6AU6. Electrically identical sections — only the heater voltage/current differs (3.15 V at 600 mA vs 6.3 V at 300 mA).
3AU6 is the American RETMA designation for the XF94.
Suppressor grid (g3) is internally connected to cathode.
Vhk_max is 100 V DC (cathode positive relative to heater).

Pin Layout — B7G

1Control Grid

2Suppressor Grid (g3,internally connected to cathode)

3Heater

Socket-Compatible Tubes ⚠ Not electrically compatible

References