Tube cross-reference
2D21W alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 2D21W specialized - thyratron. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 2D21W
These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.
5727 Specialized - Thyratron
- Base
- E7-1
- Socket
- B9A
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.6 A
Replacement tubes for 2D21W
The following tubes are recorded as possible replacements for 2D21W. This direction does not establish that 2D21W can replace them.
Specialized - Thyratron
The database records 5727 as a possible replacement for2D21W.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Specialized - Thyratron | Specialized - Thyratron |
| Construction | Thyratron | Thyratron |
| Base | Not recorded | E7-1 |
| Socket | IO | B9A |
| Base pins | 7 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.6 A |
Where 2D21W can be used as the replacement
In these recorded relationships, 2D21W is the replacement tube. The listed original tubes are not automatically suitable as replacements for 2D21W.
Specialized - Thyratron
The database records 2D21W as a possible replacement for2D21.
No special restrictions are recorded for this substitution.
| Specification | 2D21W replacement | Original tube |
|---|---|---|
| Tube type | Specialized - Thyratron | Specialized - Thyratron |
| Construction | Thyratron | Thyratron |
| Base | Not recorded | B7G |
| Socket | IO | B7G |
| Base pins | 7 | 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 2D21W as a possible replacement for5727.
No special restrictions are recorded for this substitution.
| Specification | 2D21W replacement | Original tube |
|---|---|---|
| Tube type | Specialized - Thyratron | Specialized - Thyratron |
| Construction | Thyratron | Thyratron |
| Base | Not recorded | E7-1 |
| Socket | IO | B9A |
| Base pins | 7 | 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 2D21W specifications →