Tube cross-reference
7S7 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 7S7 voltage - triode (with diode, heptode or hexode). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 7S7
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.
Replacement tubes for 7S7
The following tubes are recorded as possible replacements for 7S7. This direction does not establish that 7S7 can replace them.
Voltage - Triode (with diode, heptode or hexode)
The database records 7J7 as a possible replacement for7S7.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Heptode-Triode | Heptode-Triode |
| Base | 8BL | Not recorded |
| Socket | B8G | B8G |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.3 A | 0.32 A |
Where 7S7 can be used as the replacement
In these recorded relationships, 7S7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 7S7.
Voltage - Triode (with diode, heptode or hexode)
The database records 7S7 as a possible replacement for7J7.
No special restrictions are recorded for this substitution.
| Specification | 7S7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Heptode-Triode | Heptode-Triode |
| Base | 8BL | Not recorded |
| Socket | B8G | B8G |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.3 A | 0.32 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 7S7 specifications →