Tube cross-reference
12A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12A voltage - triode (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 12A
The following tubes are recorded as possible replacements for 12A. This direction does not establish that 12A can replace them.
Voltage - Triode (single)
The database records 112A as a possible replacement for12A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 4D | Not recorded |
| Socket | UX4 | UX4 |
| Base pins | 4 | 4 |
| Sections | 1 | 1 |
| Heater voltage | 5 V | 5 V |
| Heater current | 0.25 A | 0.25 A |
Where 12A can be used as the replacement
In these recorded relationships, 12A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12A.
Voltage - Triode (single)
The database records 12A as a possible replacement for01A.
No special restrictions are recorded for this substitution.
| Specification | 12A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 4D | 4D |
| Socket | UX4 | UX4 |
| Base pins | 4 | 4 |
| Sections | 1 | 1 |
| Heater voltage | 5 V | 5 V |
| Heater current | 0.25 A | 0.25 A |
Voltage - Triode (single)
The database records 12A as a possible replacement for112A.
No special restrictions are recorded for this substitution.
| Specification | 12A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 4D | Not recorded |
| Socket | UX4 | UX4 |
| Base pins | 4 | 4 |
| Sections | 1 | 1 |
| Heater voltage | 5 V | 5 V |
| Heater current | 0.25 A | 0.25 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 12A specifications →