EL61

Power Pentode — Loctal

Philips

Known Equivalents & Substitutes

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

Similar Tubes (Not Drop-In Compatible)

Related type listed as similar by Radiomuseum

Octal successor that replaced the EL61 almost immediately — 25 W Pa_max, universally adopted

Same 18 W power class but P8A side-contact base — electrically similar

EL5/375

Higher-voltage variant of the EL5 family, listed as similar

Electrical Specifications

Absolute Maximum

Anode Dissipation (max)Anode Dissipation (max)18W

Typical Operating

Anode Voltage (typical)Anode Voltage (typical)250V

Screen Voltage (typical)Screen Voltage (typical)250V

Heater

Heater VoltageHeater Voltage6.3V

Notes

The EL61 appeared on the market for only a brief period (approx. 1947-1950) before being superseded by the EL34.
Uses the Loctal 9-pin (B9G) base which was practically not used for the private/consumer market, contributing to its extreme rarity.
Described as 'a weaker (18 instead of 25 W) output tube' compared to the EL34 that replaced it.
Heater current of 1.35 A — same as the EL5/EL35 family.
Historical curiosity rather than a practically useful type. Very few specimens survive.

Pin Layout — Loctal

1Suppressor Grid (g3)

2Heater

3Anode