Identical electricals but 6.3 V parallel heater — not a drop-in in series-string heater circuits
Electrical Specifications
Typical Operating
Anode Voltage (typical)Anode Voltage250V
Screen Voltage (typical)Screen Voltage250V
Grid 1 Bias VoltageGrid 1 Bias Voltage-7.5V
Anode CurrentAnode Current20mA
TransconductanceTransconductance
Heater
Heater VoltageHeater Voltage35V
Heater CurrentHeater Current0.1A
Notes
Series-heater (100 mA) version of the EL8/EL2. Electrically identical sections — only the heater voltage/current differs (35 V at 100 mA vs 6.3 V at 500 mA).
The suppressor 'grid' consists of only two rods and the plate is elliptical — a minimal suppressor structure typical of beam power designs.
Part of the Philips/Valvo transitional series for AC/DC receivers with series-string heaters.
Pin functions inferred from EL8/EL13 pinout — verify against original documentation before wiring.
A rare and poorly documented type. Maximum ratings carried over from EL8 data where available.
Pin Layout — P8A
1Screen Grid (inferred from EL13 Y8A pinout — verify before use)
2Control Grid (inferred from EL13 Y8A pinout — verify before use)
3Cathode + Suppressor Grid (inferred from EL13 Y8A pinout — verify before use)
Socket-Compatible Tubes ⚠ Not electrically compatible