Tube cross-reference
6AX7 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6AX7 voltage - dual triode (similar). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6AX7
The following tubes are recorded as possible replacements for 6AX7. This direction does not establish that 6AX7 can replace them.
Voltage - Dual Triode (similar)
The database records 6AU7 as a possible replacement for6AX7.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9A | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 12.6 V |
| Heater current | 0.3 A | 0.3 A |
Voltage - Dual Triode (similar)
The database records 6GU7 as a possible replacement for6AX7.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9A | 9LP |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.6 A |
Voltage - Dual Triode (similar)
The database records 7AU7 as a possible replacement for6AX7.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9A | 9A |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.3 A | 0.3 A |
Where 6AX7 can be used as the replacement
In these recorded relationships, 6AX7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6AX7.
Voltage - Dual Triode (similar)
The database records 6AX7 as a possible replacement for6AU7.
- Not suitable for all circuits
| Specification | 6AX7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9A | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 12.6 V |
| Heater current | 0.3 A | 0.3 A |
Voltage - Dual Triode (similar)
The database records 6AX7 as a possible replacement for7AU7.
- Not suitable for all circuits
| Specification | 6AX7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9A | 9A |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.3 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 6AX7 specifications →