Tube cross-reference
5MQ8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5MQ8 voltage triode pentode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 5MQ8
The following tubes are recorded as possible replacements for 5MQ8. This direction does not establish that 5MQ8 can replace them.
Voltage Triode Tetrode
The database records 5CQ8 as a possible replacement for5MQ8.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Tetrode |
| Construction | Pentode-Triode | Tetrode-Triode |
| Base | 9FA | 9GE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5.6 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Triode Pentode
The database records 5GH8 as a possible replacement for5MQ8.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9FA | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5.6 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Where 5MQ8 can be used as the replacement
In these recorded relationships, 5MQ8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 5MQ8.
Voltage Triode Tetrode
The database records 5MQ8 as a possible replacement for5CQ8.
- Not suitable for all circuits
| Specification | 5MQ8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Tetrode |
| Construction | Pentode-Triode | Tetrode-Triode |
| Base | 9FA | 9GE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5.6 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Triode Pentode
The database records 5MQ8 as a possible replacement for5GH8A.
- Not suitable for all circuits
| Specification | 5MQ8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9FA | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5.6 V | 4.7 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 5MQ8 specifications →