Tube cross-reference
4B24 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 4B24 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 4B24
These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.
EL3C Rectifier - Full Wave
- Base
- A4-81
- Socket
- A
- Base pins
- 4
- Sections
- 2
- Heater voltage
- 2.5 V
- Heater current
- 11.5 A
Where 4B24 can be used as the replacement
In these recorded relationships, 4B24 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 4B24.
Rectifier - Full Wave
The database records 4B24 as a possible replacement forEL3C.
No special restrictions are recorded for this substitution.
| Specification | 4B24 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | Not recorded | A4-81 |
| Socket | A | A |
| Base pins | Not recorded | 4 |
| Sections | 2 | 2 |
| Heater voltage | Not recorded | 2.5 V |
| Heater current | Not recorded | 11.5 A |
Verify before substituting
Matching a base or heater voltage is not enough to prove that two tubes are interchangeable. Check pin connections, heater current, maximum ratings, bias requirements, warm-up behavior, and the equipment manufacturer’s service documentation before making a substitution.
View the complete 4B24 specifications →