Tube cross-reference
4JK6 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 4JK6 voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 4JK6
The following tubes are recorded as possible replacements for 4JK6. This direction does not establish that 4JK6 can replace them.
Voltage Pentode - Sharp Cutoff (single)
The database records 4EW6 as a possible replacement for4JK6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B9A | B7G |
| Base pins | 9 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 3.7 V | 4.2 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Pentode - Remote Cutoff (single)
The database records 4JL6 as a possible replacement for4JK6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 3.7 V | 4.2 V |
| Heater current | 0.6 A | 0.6 A |
Where 4JK6 can be used as the replacement
In these recorded relationships, 4JK6 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 4JK6.
Voltage Pentode - Remote Cutoff (single)
The database records 4JK6 as a possible replacement for4JL6.
No special restrictions are recorded for this substitution.
| Specification | 4JK6 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 3.7 V | 4.2 V |
| Heater current | 0.6 A | 0.6 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 4JK6 specifications →