Tube cross-reference
2C21 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 2C21 voltage - dual triode (similar). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 2C21
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.
1642 Voltage - Dual Triode (similar)
- Base
- 7BH
- Socket
- B7G
- Base pins
- 7
- Sections
- 2
- Heater voltage
- 6.3 V
- Heater current
- 0.6 A
Replacement tubes for 2C21
The following tubes are recorded as possible replacements for 2C21. This direction does not establish that 2C21 can replace them.
Voltage - Dual Triode (similar)
The database records 1642 as a possible replacement for2C21.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 7BH | 7BH |
| Socket | Not recorded | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.6 A |
Where 2C21 can be used as the replacement
In these recorded relationships, 2C21 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 2C21.
Voltage - Dual Triode (similar)
The database records 2C21 as a possible replacement for1642.
No special restrictions are recorded for this substitution.
| Specification | 2C21 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 7BH | 7BH |
| Socket | Not recorded | B7G |
| Base pins | 7 | 7 |
| Sections | 2 | 2 |
| 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 2C21 specifications →