← Browse 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
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
Anode Current Anode Current 45mA
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The EL61 appeared on the market for only a brief period (approx. 1947-1950) before being superseded by the EL34.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
1 2 3 4 5 6 7 8 9
1 Suppressor Grid (g3)
2 Heater
3 Anode
Socket-Compatible Tubes ⚠ Not electrically compatible