Tube cross-reference
25D4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 25D4 rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.
Where 25D4 can be used as the replacement
In these recorded relationships, 25D4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 25D4.
Rectifier - Damper Diode
The database records 25D4 as a possible replacement for25AX4GT.
No special restrictions are recorded for this substitution.
| Specification | 25D4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 4G |
| Socket | Not recorded | IO |
| Base pins | 8 | 6 |
| Sections | 1 | 1 |
| Heater voltage | 25 V | 25 V |
| Heater current | 0.3 A | 0.3 A |
Rectifier - Damper Diode
The database records 25D4 as a possible replacement for25U4GT.
No special restrictions are recorded for this substitution.
| Specification | 25D4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 4GG |
| Socket | Not recorded | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 25 V | 25 V |
| Heater current | 0.3 A | 0.3 A |
Rectifier - Damper Diode
The database records 25D4 as a possible replacement for25W4GT.
No special restrictions are recorded for this substitution.
| Specification | 25D4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 4CG |
| Socket | Not recorded | IO |
| Base pins | 8 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 25 V | 25 V |
| Heater current | 0.3 A | 0.3 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 25D4 specifications →