Tube cross-reference
6U3 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6U3 rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6U3
These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.
EY80 Rectifier - Damper Diode
- Base
- Not recorded
- Socket
- B9A
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
Replacement tubes for 6U3
The following tubes are recorded as possible replacements for 6U3. This direction does not establish that 6U3 can replace them.
Rectifier - Damper Diode
The database records EY80 as a possible replacement for6U3.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 9BM | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.3 A |
Where 6U3 can be used as the replacement
In these recorded relationships, 6U3 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6U3.
Rectifier - Damper Diode
The database records 6U3 as a possible replacement forEY80.
No special restrictions are recorded for this substitution.
| Specification | 6U3 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 9BM | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.3 A |
Rectifier - Half Wave
The database records 6U3 as a possible replacement for6N3.
No special restrictions are recorded for this substitution.
| Specification | 6U3 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Half Wave |
| Construction | Rectifier | Rectifier |
| Base | 9BM | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.9 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 6U3 specifications →