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