Tube cross-reference
EN91 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EN91 specialized - thyratron. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for EN91
The following tubes are recorded as possible replacements for EN91. This direction does not establish that EN91 can replace them.
Specialized - Thyratron
The database records 2D21 as a possible replacement forEN91.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Specialized - Thyratron | Specialized - Thyratron |
| Construction | Thyratron | Thyratron |
| Base | Not recorded | B7G |
| Socket | B7G | B7G |
| Base pins | Not recorded | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.6 A |
Where EN91 can be used as the replacement
In these recorded relationships, EN91 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EN91.
Specialized - Thyratron
The database records EN91 as a possible replacement for2D21.
No special restrictions are recorded for this substitution.
| Specification | EN91 replacement | Original tube |
|---|---|---|
| Tube type | Specialized - Thyratron | Specialized - Thyratron |
| Construction | Thyratron | Thyratron |
| Base | Not recorded | B7G |
| Socket | B7G | B7G |
| Base pins | Not recorded | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.6 A |
Specialized - Thyratron
The database records EN91 as a possible replacement for5727.
No special restrictions are recorded for this substitution.
| Specification | EN91 replacement | Original tube |
|---|---|---|
| Tube type | Specialized - Thyratron | Specialized - Thyratron |
| Construction | Thyratron | Thyratron |
| Base | Not recorded | E7-1 |
| Socket | B7G | B9A |
| Base pins | Not recorded | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.6 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 EN91 specifications →