Tube cross-reference
7A4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 7A4 voltage - triode (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 7A4
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.
XXL Voltage - Triode (single)
- Base
- Not recorded
- Socket
- B8G
- Base pins
- 6
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
Replacement tubes for 7A4
The following tubes are recorded as possible replacements for 7A4. This direction does not establish that 7A4 can replace them.
Voltage - Triode (single)
The database records XXL as a possible replacement for7A4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 5AC | Not recorded |
| Socket | LOCTAL8 | B8G |
| Base pins | 8 | 6 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where 7A4 can be used as the replacement
In these recorded relationships, 7A4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 7A4.
Voltage - Triode (single)
The database records 7A4 as a possible replacement for7B4.
- Not suitable for all circuits
| Specification | 7A4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 5AC | 5AC |
| Socket | LOCTAL8 | LOCTAL8 |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.3 A | 0.32 A |
Voltage - Triode (single)
The database records 7A4 as a possible replacement forXXL.
No special restrictions are recorded for this substitution.
| Specification | 7A4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 5AC | Not recorded |
| Socket | LOCTAL8 | B8G |
| Base pins | 8 | 6 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 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 7A4 specifications →