Tube cross-reference
UY42 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the UY42 rectifier - half wave. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for UY42
The following tubes are recorded as possible replacements for UY42. This direction does not establish that UY42 can replace them.
Rectifier - Half Wave
The database records 31A3 as a possible replacement forUY42.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Half Wave | Rectifier - Half Wave |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 8HB |
| Socket | B8A | Not recorded |
| Base pins | 8 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 31 V | 31 V |
| Heater current | 0.1 A | 0.1 A |
Where UY42 can be used as the replacement
In these recorded relationships, UY42 is the replacement tube. The listed original tubes are not automatically suitable as replacements for UY42.
Rectifier - Half Wave
The database records UY42 as a possible replacement for31A3.
No special restrictions are recorded for this substitution.
| Specification | UY42 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Half Wave | Rectifier - Half Wave |
| Construction | Rectifier | Rectifier |
| Base | Not recorded | 8HB |
| Socket | B8A | Not recorded |
| Base pins | 8 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 31 V | 31 V |
| Heater current | 0.1 A | 0.1 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 UY42 specifications →