Tube cross-reference
12D4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12D4 rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 12D4
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.
12DM4 Rectifier - Damper Diode
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 12.6 V
- Heater current
- 0.6 A
Replacement tubes for 12D4
The following tubes are recorded as possible replacements for 12D4. This direction does not establish that 12D4 can replace them.
Rectifier - Damper Diode
The database records 12AX4GTB as a possible replacement for12D4.
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 | 4CG |
| Socket | B9A | Not recorded |
| Base pins | 5 | 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 | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | Not recorded |
| Socket | B9A | Not recorded |
| Base pins | 5 | 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 12DM4 as a possible replacement for12D4.
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 | B9A | Not recorded |
| Base pins | 5 | 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 for12D4.
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 | B9A | IO |
| Base pins | 5 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.6 A | 0.6 A |
Where 12D4 can be used as the replacement
In these recorded relationships, 12D4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12D4.
Rectifier - Damper Diode
The database records 12D4 as a possible replacement for12AX4GT.
No special restrictions are recorded for this substitution.
| Specification | 12D4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | Not recorded |
| Socket | B9A | IO |
| Base pins | 5 | 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 12D4 as a possible replacement for12AX4GTA.
No special restrictions are recorded for this substitution.
| Specification | 12D4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 4CG |
| Socket | B9A | IO |
| Base pins | 5 | 8 |
| 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 12D4 specifications →