Tube cross-reference
7Z4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 7Z4 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.
Where 7Z4 can be used as the replacement
In these recorded relationships, 7Z4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 7Z4.
7Y4
Receiving TubesRectifier - Full Wave
The database records 7Z4 as a possible replacement for7Y4.
- Parallel heater circuits only
| Specification | 7Z4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | 5AB | 5AB |
| Socket | B8G | B8G |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.5 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 7Z4 specifications →