Tube cross-reference
2X2 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 2X2 rectifier - half wave. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 2X2
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.
Replacement tubes for 2X2
The following tubes are recorded as possible replacements for 2X2. This direction does not establish that 2X2 can replace them.
Rectifier - Half Wave
The database records 879 as a possible replacement for2X2.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Half Wave | Rectifier - Half Wave |
| Construction | Rectifier | Rectifier |
| Base | 4P | 4P |
| Socket | Not recorded | SMALL4 |
| Base pins | 7 | 4 |
| Sections | 1 | 1 |
| Heater voltage | 2.5 V | 2.5 V |
| Heater current | 1.75 A | 1.75 A |
Where 2X2 can be used as the replacement
In these recorded relationships, 2X2 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 2X2.
Rectifier - Half Wave
The database records 2X2 as a possible replacement for879.
No special restrictions are recorded for this substitution.
| Specification | 2X2 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Half Wave | Rectifier - Half Wave |
| Construction | Rectifier | Rectifier |
| Base | 4P | 4P |
| Socket | Not recorded | SMALL4 |
| Base pins | 7 | 4 |
| Sections | 1 | 1 |
| Heater voltage | 2.5 V | 2.5 V |
| Heater current | 1.75 A | 1.75 A |
Rectifier - Half Wave
The database records 2X2 as a possible replacement for2Y2.
No special restrictions are recorded for this substitution.
| Specification | 2X2 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Half Wave | Rectifier - Half Wave |
| Construction | Rectifier | Rectifier |
| Base | 4P | Not recorded |
| Socket | Not recorded | Not recorded |
| Base pins | 7 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 2.5 V | 2.5 V |
| Heater current | 1.75 A | 1.75 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 2X2 specifications →