Tube cross-reference
12G4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12G4 voltage - triode (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 12G4
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.
12H4 Voltage - Triode (single)
- Base
- 7DM
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 12.6 V
- Heater current
- 0.15 A
Replacement tubes for 12G4
The following tubes are recorded as possible replacements for 12G4. This direction does not establish that 12G4 can replace them.
Voltage - Triode (single)
The database records 12H4 as a possible replacement for12G4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 7B6 | 7DM |
| 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 12G4 specifications →