Tube cross-reference
4JW8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 4JW8 voltage triode pentode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 4JW8
The following tubes are recorded as possible replacements for 4JW8. This direction does not establish that 4JW8 can replace them.
Voltage Triode Pentode
The database records 5JW8 as a possible replacement for4JW8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | Not recorded | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.5 V | 4.7 V |
| Heater current | 0.6 A | 0.6 A |
Where 4JW8 can be used as the replacement
In these recorded relationships, 4JW8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 4JW8.
Voltage Triode Pentode
The database records 4JW8 as a possible replacement for5JW8.
No special restrictions are recorded for this substitution.
| Specification | 4JW8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | Not recorded | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.5 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 4JW8 specifications →