Tube cross-reference
5B8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5B8 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 5B8
The following tubes are recorded as possible replacements for 5B8. This direction does not establish that 5B8 can replace them.
Voltage Triode Pentode
The database records 5AV8 as a possible replacement for5B8.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9EC | 9DZ |
| 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 |
Where 5B8 can be used as the replacement
In these recorded relationships, 5B8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 5B8.
Voltage Triode Pentode
The database records 5B8 as a possible replacement for5AV8.
- Not suitable for all circuits
| Specification | 5B8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9EC | 9DZ |
| 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 |
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 5B8 specifications →