Tube cross-reference
12D4A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12D4A rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 12D4A
The following tubes are recorded as possible replacements for 12D4A. This direction does not establish that 12D4A can replace them.
Rectifier - Damper Diode
The database records 12DM4 as a possible replacement for12D4A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | Not recorded |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.6 A | 0.6 A |
Rectifier - Damper Diode
The database records 12DM4A as a possible replacement for12D4A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | IO |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.6 A | 0.6 A |
Where 12D4A can be used as the replacement
In these recorded relationships, 12D4A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12D4A.
Rectifier - Damper Diode
The database records 12D4A as a possible replacement for12AX4GT.
No special restrictions are recorded for this substitution.
| Specification | 12D4A replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | IO |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.6 A | 0.6 A |
Rectifier - Damper Diode
The database records 12D4A as a possible replacement for12AX4GTA.
No special restrictions are recorded for this substitution.
| Specification | 12D4A replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 4CG |
| Socket | Not recorded | IO |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.6 A | 0.6 A |
Rectifier - Damper Diode
The database records 12D4A as a possible replacement for12AX4GTB.
No special restrictions are recorded for this substitution.
| Specification | 12D4A replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 4CG |
| Socket | Not recorded | Not recorded |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.6 A | 0.6 A |
Rectifier - Damper Diode
The database records 12D4A as a possible replacement for12D4.
No special restrictions are recorded for this substitution.
| Specification | 12D4A replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | B9A |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.6 A | 0.6 A |
Rectifier - Damper Diode
The database records 12D4A as a possible replacement for12DM4.
No special restrictions are recorded for this substitution.
| Specification | 12D4A replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | Not recorded |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.6 A | 0.6 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 12D4A specifications →