Tube cross-reference
12SF7 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12SF7 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 12SF7
The following tubes are recorded as possible replacements for 12SF7. This direction does not establish that 12SF7 can replace them.
Voltage Radio Detector Converter
The database records 12SF7GT as a possible replacement for12SF7.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Radio Detector Converter |
| Construction | Diode-Pentode | Diode-Diode-Pentode |
| Base | 7AZ | 7AZ |
| Socket | Not recorded | IO |
| Base pins | 7 | 8 |
| Sections | 2 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Where 12SF7 can be used as the replacement
In these recorded relationships, 12SF7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12SF7.
Voltage Radio Detector Converter
The database records 12SF7 as a possible replacement for12SF7GT.
No special restrictions are recorded for this substitution.
| Specification | 12SF7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Radio Detector Converter |
| Construction | Diode-Pentode | Diode-Diode-Pentode |
| Base | 7AZ | 7AZ |
| Socket | Not recorded | IO |
| Base pins | 7 | 8 |
| Sections | 2 | 3 |
| 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 12SF7 specifications →