Tube cross-reference
EF41 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EF41 voltage pentode - remote cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of EF41
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.
6CJ5 Voltage Pentode - Remote Cutoff (single)
- Base
- OCTAL
- Socket
- IO
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.2 A
Replacement tubes for EF41
The following tubes are recorded as possible replacements for EF41. This direction does not establish that EF41 can replace them.
Voltage Pentode - Remote Cutoff (single)
The database records 6CJ5 as a possible replacement forEF41.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | RIMLOCK | OCTAL |
| Socket | B8A | IO |
| Base pins | 8 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 A |
Where EF41 can be used as the replacement
In these recorded relationships, EF41 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EF41.
Voltage Pentode - Remote Cutoff (single)
The database records EF41 as a possible replacement for6CJ5.
No special restrictions are recorded for this substitution.
| Specification | EF41 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | RIMLOCK | OCTAL |
| Socket | B8A | IO |
| Base pins | 8 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 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 EF41 specifications →