Tube cross-reference
R3 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the R3 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for R3
The following tubes are recorded as possible replacements for R3. This direction does not establish that R3 can replace them.
1W4
American To ForeignVoltage Pentode
The database records 1W4 as a possible replacement forR3.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Full Wave | Voltage Pentode |
| Construction | Rectifier-Rectifier | Pentode |
| Base | Not recorded | 5BZ |
| Socket | Not recorded | B7G |
| Base pins | Not recorded | 7 |
| Sections | 2 | 1 |
| Heater voltage | 4 V | 1.4 V |
| Heater current | 2.5 A | 0.05 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 R3 specifications →