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