Tube cross-reference
EF39 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EF39 voltage pentode - remote cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for EF39
The following tubes are recorded as possible replacements for EF39. This direction does not establish that EF39 can replace them.
Voltage Pentode - Remote Cutoff (single)
The database records 6K7 as a possible replacement forEF39.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | OCTAL | 7R |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.3 A |
Where EF39 can be used as the replacement
In these recorded relationships, EF39 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EF39.
Voltage Pentode - Remote Cutoff (single)
The database records EF39 as a possible replacement for6K7.
- Parallel heater circuits only
| Specification | EF39 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | OCTAL | 7R |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.3 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 EF39 specifications →