Tube cross-reference
5AU4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5AU4 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 5AU4
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.
5V3 Rectifier - Full Wave
- Base
- Not recorded
- Socket
- IO
- Base pins
- 8
- Sections
- 2
- Heater voltage
- 5 V
- Heater current
- 3.8 A
Replacement tubes for 5AU4
The following tubes are recorded as possible replacements for 5AU4. This direction does not establish that 5AU4 can replace them.
Rectifier - Full Wave
The database records 5V3 as a possible replacement for5AU4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5T | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 5 V |
| Heater current | 3.75 A | 3.8 A |
Rectifier - Full Wave
The database records 5V3A as a possible replacement for5AU4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5T | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 5 V |
| Heater current | 3.75 A | 3 A |
Where 5AU4 can be used as the replacement
In these recorded relationships, 5AU4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 5AU4.
Rectifier - Full Wave
The database records 5AU4 as a possible replacement for5AW4.
No special restrictions are recorded for this substitution.
| Specification | 5AU4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5T | 5T |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 5 V |
| Heater current | 3.75 A | 3 A |
Rectifier - Full Wave
The database records 5AU4 as a possible replacement for5U4G.
No special restrictions are recorded for this substitution.
| Specification | 5AU4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5T | 5T |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 5 V |
| Heater current | 3.75 A | 3 A |
Rectifier - Full Wave
The database records 5AU4 as a possible replacement for5U4GA.
No special restrictions are recorded for this substitution.
| Specification | 5AU4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5T | 5T |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 5 V |
| Heater current | 3.75 A | 3 A |
Rectifier - Full Wave
The database records 5AU4 as a possible replacement for5U4GB.
No special restrictions are recorded for this substitution.
| Specification | 5AU4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5T | 5T |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 5 V |
| Heater current | 3.75 A | 3 A |
Rectifier - Full Wave
The database records 5AU4 as a possible replacement for5V3.
No special restrictions are recorded for this substitution.
| Specification | 5AU4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5T | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 5 V |
| Heater current | 3.75 A | 3.8 A |
Rectifier - Full Wave
The database records 5AU4 as a possible replacement for5V3A.
No special restrictions are recorded for this substitution.
| Specification | 5AU4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5T | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 5 V | 5 V |
| Heater current | 3.75 A | 3 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 5AU4 specifications →