Tube cross-reference
2A3 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 2A3 power - triode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 2A3
The following tubes are recorded as possible replacements for 2A3. This direction does not establish that 2A3 can replace them.
Power - Triode
The database records 5930 as a possible replacement for2A3.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Triode | Power - Triode |
| Construction | Triode | Triode |
| Base | 4D | 4D |
| Socket | UX4 | UX4 |
| Base pins | 4 | 4 |
| Sections | 1 | 1 |
| Heater voltage | 2.5 V | 2.5 V |
| Heater current | 2.5 A | 2.5 A |
Power - Triode
The database records 2A3H as a possible replacement for2A3.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Triode | Power - Triode |
| Construction | Triode | Triode |
| Base | 4D | Not recorded |
| Socket | UX4 | UX4 |
| Base pins | 4 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 2.5 V | 2.5 V |
| Heater current | 2.5 A | 2.5 A |
Where 2A3 can be used as the replacement
In these recorded relationships, 2A3 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 2A3.
Power - Triode
The database records 2A3 as a possible replacement for2A3H.
No special restrictions are recorded for this substitution.
| Specification | 2A3 replacement | Original tube |
|---|---|---|
| Tube type | Power - Triode | Power - Triode |
| Construction | Triode | Triode |
| Base | 4D | Not recorded |
| Socket | UX4 | UX4 |
| Base pins | 4 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 2.5 V | 2.5 V |
| Heater current | 2.5 A | 2.5 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 2A3 specifications →