Tube cross-reference
12Z5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12Z5 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 12Z5
The following tubes are recorded as possible replacements for 12Z5. This direction does not establish that 12Z5 can replace them.
Rectifier - Full Wave
The database records 6Z5 as a possible replacement for12Z5.
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 | Not recorded | 6K |
| Socket | Not recorded | IO |
| Base pins | 6 | 6 |
| Sections | 2 | 2 |
| Heater voltage | 12.6 V | 6.3 V |
| Heater current | 0.4 A | 0.8 A |
Where 12Z5 can be used as the replacement
In these recorded relationships, 12Z5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12Z5.
Rectifier - Full Wave
The database records 12Z5 as a possible replacement for6Z5.
No special restrictions are recorded for this substitution.
| Specification | 12Z5 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | Not recorded | 6K |
| Socket | Not recorded | IO |
| Base pins | 6 | 6 |
| Sections | 2 | 2 |
| Heater voltage | 12.6 V | 6.3 V |
| Heater current | 0.4 A | 0.8 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 12Z5 specifications →