Tube cross-reference
6AJ4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6AJ4 voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6AJ4
The following tubes are recorded as possible replacements for 6AJ4. This direction does not establish that 6AJ4 can replace them.
Voltage - Triode (single)
The database records EC84 as a possible replacement for6AJ4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 9BX | Not recorded |
| Socket | Not recorded | B9A |
| Base pins | Not recorded | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.225 A | 0.225 A |
Voltage - Triode (single high frequency)
The database records 6AM4 as a possible replacement for6AJ4.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | 9BX | 98X |
| Socket | Not recorded | B9A |
| Base pins | Not recorded | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.225 A | 0.225 A |
Where 6AJ4 can be used as the replacement
In these recorded relationships, 6AJ4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6AJ4.
Voltage - Triode (single)
The database records 6AJ4 as a possible replacement forEC84.
No special restrictions are recorded for this substitution.
| Specification | 6AJ4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 9BX | Not recorded |
| Socket | Not recorded | B9A |
| Base pins | Not recorded | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.225 A | 0.225 A |
Voltage - Triode (single high frequency)
The database records 6AJ4 as a possible replacement for6AM4.
- Not suitable for all circuits
| Specification | 6AJ4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | 9BX | 98X |
| Socket | Not recorded | B9A |
| Base pins | Not recorded | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.225 A | 0.225 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 6AJ4 specifications →