Tube cross-reference
2B4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 2B4 specialized - thyratron. Compare core specifications and verify every restriction before using a replacement.
Where 2B4 can be used as the replacement
In these recorded relationships, 2B4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 2B4.
Specialized - Thyratron
The database records 2B4 as a possible replacement for885.
No special restrictions are recorded for this substitution.
| Specification | 2B4 replacement | Original tube |
|---|---|---|
| Tube type | Specialized - Thyratron | Specialized - Thyratron |
| Construction | Thyratron | Thyratron |
| Base | 5A | 5A2 |
| Socket | IO | UX4 |
| Base pins | 5 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 2.5 V | 2.5 V |
| Heater current | 1.4 A | 1.5 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 2B4 specifications →