Tube cross-reference
5643 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5643 specialized - thyratron. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 5643
The following tubes are recorded as possible replacements for 5643. This direction does not establish that 5643 can replace them.
Specialized - Thyratron
The database records EN70 as a possible replacement for5643.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Specialized - Thyratron | Specialized - Thyratron |
| Construction | Thyratron | Thyratron |
| Base | Not recorded | Not recorded |
| Socket | B8D | Not recorded |
| Base pins | 8 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 A | 0.15 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 5643 specifications →