Tube cross-reference
5U8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5U8 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 5U8
The following tubes are recorded as possible replacements for 5U8. This direction does not establish that 5U8 can replace them.
Voltage Radio Detector Converter
The database records XCF80 as a possible replacement for5U8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9AE | 9DC |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 6.3 V |
| Heater current | 0.6 A | 0.3 A |
Voltage Radio Detector Converter
The database records 5EA8 as a possible replacement for5U8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Triode Pentode
The database records 5GH8 as a possible replacement for5U8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Triode Pentode
The database records 5GH8A as a possible replacement for5U8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Where 5U8 can be used as the replacement
In these recorded relationships, 5U8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 5U8.
Voltage Triode Pentode
The database records 5U8 as a possible replacement forXCF82.
No special restrictions are recorded for this substitution.
| Specification | 5U8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9AE | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 6.3 V |
| Heater current | 0.6 A | 0.3 A |
Voltage Radio Detector Converter
The database records 5U8 as a possible replacement for4BL8.
No special restrictions are recorded for this substitution.
| Specification | 5U8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9AE | 9DC |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 4.6 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Triode Tetrode
The database records 5U8 as a possible replacement for5CQ8.
- Not suitable for all circuits
| Specification | 5U8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Triode Tetrode |
| Construction | Pentode-Triode | Tetrode-Triode |
| Base | 9AE | 9GE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Radio Detector Converter
The database records 5U8 as a possible replacement for5EA8.
No special restrictions are recorded for this substitution.
| Specification | 5U8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Voltage Triode Pentode
The database records 5U8 as a possible replacement for5GH8.
No special restrictions are recorded for this substitution.
| Specification | 5U8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 5 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 5U8 specifications →