Tube cross-reference
25U4GT alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 25U4GT rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 25U4GT
The following tubes are recorded as possible replacements for 25U4GT. This direction does not establish that 25U4GT can replace them.
Rectifier - Damper Diode
The database records 25AX4GT as a possible replacement for25U4GT.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4GG | 4G |
| Socket | IO | 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 | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4GG | Not recorded |
| Socket | IO | Not recorded |
| 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 25W4GT as a possible replacement for25U4GT.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4GG | 4CG |
| Socket | IO | IO |
| Base pins | 8 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 25 V | 25 V |
| Heater current | 0.3 A | 0.3 A |
Where 25U4GT can be used as the replacement
In these recorded relationships, 25U4GT is the replacement tube. The listed original tubes are not automatically suitable as replacements for 25U4GT.
Rectifier - Damper Diode
The database records 25U4GT as a possible replacement for25W4GT.
No special restrictions are recorded for this substitution.
| Specification | 25U4GT replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4GG | 4CG |
| Socket | IO | 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 25U4GT specifications →