Tube cross-reference
1W4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1W4 voltage pentode. Compare core specifications and verify every restriction before using a replacement.
Where 1W4 can be used as the replacement
In these recorded relationships, 1W4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1W4.
Rectifier - Full Wave
The database records 1W4 as a possible replacement forR3.
No special restrictions are recorded for this substitution.
| Specification | 1W4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode | Rectifier - Full Wave |
| Construction | Pentode | Rectifier-Rectifier |
| Base | 5BZ | Not recorded |
| Socket | B7G | Not recorded |
| Base pins | 7 | Not recorded |
| Sections | 1 | 2 |
| Heater voltage | 1.4 V | 4 V |
| Heater current | 0.05 A | 2.5 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 1W4 specifications →