Tube cross-reference
1003 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1003 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 1003
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.
0Z4 Rectifier - Full Wave
- Base
- 4R
- Socket
- IO
- Base pins
- 4
- Sections
- 2
- Heater voltage
- Not recorded
- Heater current
- Not recorded
Where 1003 can be used as the replacement
In these recorded relationships, 1003 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1003.
Rectifier - Full Wave
The database records 1003 as a possible replacement for0Z4.
No special restrictions are recorded for this substitution.
| Specification | 1003 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | Not recorded | 4R |
| Socket | IO | IO |
| Base pins | 8 | 4 |
| Sections | 2 | 2 |
| Heater voltage | Not recorded | Not recorded |
| Heater current | Not recorded | Not recorded |
Rectifier - Full Wave
The database records 1003 as a possible replacement for0Z4A.
No special restrictions are recorded for this substitution.
| Specification | 1003 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | Not recorded | 8XD |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | Not recorded | Not recorded |
| Heater current | Not recorded | Not recorded |
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 1003 specifications →