Tube cross-reference
259A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 259A voltage tetrode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 259A
The following tubes are recorded as possible replacements for 259A. This direction does not establish that 259A can replace them.
Voltage Tetrode
The database records 259B as a possible replacement for259A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Tetrode | Voltage Tetrode |
| Construction | Tetrode | Tetrode |
| Base | Not recorded | Not recorded |
| Socket | MEDIUM5 | MEDIUM4BAYONET |
| Base pins | 5 | 4 |
| Sections | 1 | 1 |
| Heater voltage | 2 V | 2 V |
| Heater current | 1.6 A | 1.6 A |
Where 259A can be used as the replacement
In these recorded relationships, 259A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 259A.
Voltage Tetrode
The database records 259A as a possible replacement for259B.
No special restrictions are recorded for this substitution.
| Specification | 259A replacement | Original tube |
|---|---|---|
| Tube type | Voltage Tetrode | Voltage Tetrode |
| Construction | Tetrode | Tetrode |
| Base | Not recorded | Not recorded |
| Socket | MEDIUM5 | MEDIUM4BAYONET |
| Base pins | 5 | 4 |
| Sections | 1 | 1 |
| Heater voltage | 2 V | 2 V |
| Heater current | 1.6 A | 1.6 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 259A specifications →