Tube cross-reference
6203 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6203 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6203
The following tubes are recorded as possible replacements for 6203. This direction does not establish that 6203 can replace them.
Rectifier - Full Wave
The database records 6Z31 as a possible replacement for6203.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | E9-1 | Not recorded |
| Socket | B9A | B7G |
| Base pins | 9 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.6 A |
Rectifier - Full Wave
The database records EZ90 as a possible replacement for6203.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | E9-1 | Not recorded |
| Socket | B9A | Not recorded |
| Base pins | 9 | Not recorded |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.6 A |
Rectifier - Full Wave
The database records U78 as a possible replacement for6203.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | E9-1 | Not recorded |
| Socket | B9A | B7G |
| Base pins | 9 | Not recorded |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.9 A | 0.6 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 6203 specifications →