Tube cross-reference
6JU8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6JU8 diode (not rectifier). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6JU8
The following tubes are recorded as possible replacements for 6JU8. This direction does not establish that 6JU8 can replace them.
Diode (NOT rectifier)
The database records 6JU8A as a possible replacement for6JU8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Diode (NOT rectifier) | Diode (NOT rectifier) |
| Construction | Diode-Diode-Diode-Diode | Diode-Diode-Diode-Diode |
| Base | E9-1 | E9-1 |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 4 | 4 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.6 A |
Where 6JU8 can be used as the replacement
In these recorded relationships, 6JU8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6JU8.
Diode (NOT rectifier)
The database records 6JU8 as a possible replacement for6JU8A.
No special restrictions are recorded for this substitution.
| Specification | 6JU8 replacement | Original tube |
|---|---|---|
| Tube type | Diode (NOT rectifier) | Diode (NOT rectifier) |
| Construction | Diode-Diode-Diode-Diode | Diode-Diode-Diode-Diode |
| Base | E9-1 | E9-1 |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 4 | 4 |
| Heater voltage | 6.3 V | 6.3 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 6JU8 specifications →