Tube cross-reference
8AU8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 8AU8 voltage triode pentode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 8AU8
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.
8BA8 NEW (being researched)
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- Not recorded
- Heater current
- Not recorded
Replacement tubes for 8AU8
The following tubes are recorded as possible replacements for 8AU8. This direction does not establish that 8AU8 can replace them.
Voltage Triode Pentode
The database records 8AU8A as a possible replacement for8AU8.
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 | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Triode Pentode
The database records 8AW8A as a possible replacement for8AU8.
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 | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Triode Pentode
The database records 8BA8A as a possible replacement for8AU8.
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 | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Triode Pentode
The database records 8BH8 as a possible replacement for8AU8.
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 | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 A |
Where 8AU8 can be used as the replacement
In these recorded relationships, 8AU8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 8AU8.
Voltage Triode Pentode
The database records 8AU8 as a possible replacement for8AU8A.
No special restrictions are recorded for this substitution.
| Specification | 8AU8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Triode Pentode
The database records 8AU8 as a possible replacement for8AW8A.
No special restrictions are recorded for this substitution.
| Specification | 8AU8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Triode Pentode
The database records 8AU8 as a possible replacement for8BA8A.
No special restrictions are recorded for this substitution.
| Specification | 8AU8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Triode Pentode
The database records 8AU8 as a possible replacement for8BH8.
No special restrictions are recorded for this substitution.
| Specification | 8AU8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Triode Pentode
The database records 8AU8 as a possible replacement for8KS8.
No special restrictions are recorded for this substitution.
| Specification | 8AU8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Triode Pentode | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 A | 0.45 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 8AU8 specifications →