Tube cross-reference
12SF5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12SF5 voltage - triode (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 12SF5
The following tubes are recorded as possible replacements for 12SF5. This direction does not establish that 12SF5 can replace them.
Voltage - Triode (single)
The database records 12SF5GT as a possible replacement for12SF5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 6AB | 6AB |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Where 12SF5 can be used as the replacement
In these recorded relationships, 12SF5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12SF5.
Voltage - Triode (single)
The database records 12SF5 as a possible replacement for12SF5GT.
No special restrictions are recorded for this substitution.
| Specification | 12SF5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 6AB | 6AB |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| 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 12SF5 specifications →