Tube cross-reference
U709 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the U709 rectifier - full wave. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for U709
The following tubes are recorded as possible replacements for U709. This direction does not establish that U709 can replace them.
Rectifier - Full Wave
The database records 6CA4 as a possible replacement forU709.
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 | 9M |
| Socket | B9A | B9A |
| Base pins | Not recorded | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.95 A | 1 A |
Where U709 can be used as the replacement
In these recorded relationships, U709 is the replacement tube. The listed original tubes are not automatically suitable as replacements for U709.
Rectifier - Full Wave
The database records U709 as a possible replacement for6CA4.
No special restrictions are recorded for this substitution.
| Specification | U709 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Full Wave | Rectifier - Full Wave |
| Construction | Rectifier-Rectifier | Rectifier-Rectifier |
| Base | Not recorded | 9M |
| Socket | B9A | B9A |
| Base pins | Not recorded | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.95 A | 1 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 U709 specifications →