4694 — Power Pentode, P8A | Tubeofile
TUBEOFILE
← Browse Philips Medium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
Known Equivalents & Substitutes
Similar Tubes (Not Drop-In Compatible)
EL3/425
Higher voltage-selected variant rated to 425 V Standard version rated to 250 V — electrically near-identical, but lower max voltage rating Related Philips type — similar but different characteristics Electrical Specifications
Absolute Maximum
Anode Voltage (max) Anode Voltage (max) 375V
Screen Voltage (max) Screen Voltage (max) 275V
Anode Dissipation (max) Anode Dissipation (max) 9W
Typical Operating
Anode Voltage (typical) Anode Voltage 250V
Notes
4694 and EL3/375 are identical — '4694' is the Philips factory number, 'EL3/375' is the Mullard-Philips designation. Anode connection via top cap. P8A side-contact base carries heater, cathode, grids, and metallization. Cathode-bias only — fixed bias is prohibited per the datasheet, same as all EL3 variants. Factory-selected for operation at Va up to 375 V; standard EL3N is rated to 250 V. Pin Layout — P8A
1 2 3 4 5 6 7 8
1 Control Grid
2 Cathode
3 Heater
4
Socket-Compatible Tubes ⚠ Not electrically compatible
Screen Voltage (typical) Screen Voltage
250V
Grid 1 Bias Voltage Grid 1 Bias Voltage -6V
Anode Current Anode Current 36mA
Screen Current Screen Current 4mA
Anode Resistance Anode Resistance 50,000Ω
Transconductance Transconductance 9mA/V
Output
Output Power Output Power (Class A SE) 4.5W
Heater
Heater Voltage Heater Voltage 6.3V
Heater Current Heater Current 0.9A
Heater
6 Metallization (external shield)
7 Suppressor Grid (internally connected to cathode)
TC Top Cap — Anode (top cap)