Tube cross-reference
5CQ8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5CQ8 voltage triode tetrode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 5CQ8
The following tubes are recorded as possible replacements for 5CQ8. This direction does not establish that 5CQ8 can replace them.
Voltage Radio Detector Converter
The database records 5EA8 as a possible replacement for5CQ8.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Triode Tetrode | Voltage Radio Detector Converter |
| Construction | Tetrode-Triode | Pentode-Triode |
| Base | 9GE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Triode Pentode
The database records 5MQ8 as a possible replacement for5CQ8.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Triode Tetrode | Voltage Triode Pentode |
| Construction | Tetrode-Triode | Pentode-Triode |
| Base | 9GE | 9FA |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 5.6 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Radio Detector Converter
The database records 5U8 as a possible replacement for5CQ8.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Triode Tetrode | Voltage Radio Detector Converter |
| Construction | Tetrode-Triode | Pentode-Triode |
| Base | 9GE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 5 V |
| Heater current | 0.6 A | 0.6 A |
Where 5CQ8 can be used as the replacement
In these recorded relationships, 5CQ8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 5CQ8.
Voltage Radio Detector Converter
The database records 5CQ8 as a possible replacement for4BL8.
- Not suitable for all circuits
| Specification | 5CQ8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Tetrode | Voltage Radio Detector Converter |
| Construction | Tetrode-Triode | Pentode-Triode |
| Base | 9GE | 9DC |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.6 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Triode Pentode
The database records 5CQ8 as a possible replacement for5MQ8.
- Not suitable for all circuits
| Specification | 5CQ8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Tetrode | Voltage Triode Pentode |
| Construction | Tetrode-Triode | Pentode-Triode |
| Base | 9GE | 9FA |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 5.6 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 5CQ8 specifications →