Tube cross-reference
12H4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12H4 voltage - triode (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 12H4
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.
12G4 Voltage - Triode (single)
- Base
- 7B6
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 12.6 V
- Heater current
- 0.15 A
Where 12H4 can be used as the replacement
In these recorded relationships, 12H4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12H4.
Voltage - Triode (single)
The database records 12H4 as a possible replacement for12G4.
No special restrictions are recorded for this substitution.
| Specification | 12H4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 7DM | 7B6 |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 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 12H4 specifications →