Tube cross-reference
12F31 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12F31 voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 12F31
The following tubes are recorded as possible replacements for 12F31. This direction does not establish that 12F31 can replace them.
Power - TV Horizontal Output (sweep)
The database records 12GW6 as a possible replacement for12F31.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Power - TV Horizontal Output (sweep) |
| Construction | Pentode | BeamPower |
| Base | Not recorded | 6AM |
| Socket | Not recorded | OCTAL7 |
| Base pins | Not recorded | 7 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.6 A |
Where 12F31 can be used as the replacement
In these recorded relationships, 12F31 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12F31.
Voltage Pentode - Sharp Cutoff (single)
The database records 12F31 as a possible replacement for12AU6.
No special restrictions are recorded for this substitution.
| Specification | 12F31 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7BK |
| Socket | Not recorded | B7G |
| Base pins | Not recorded | 7 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Voltage Pentode - Remote Cutoff (single)
The database records 12F31 as a possible replacement for12BA6.
No special restrictions are recorded for this substitution.
| Specification | 12F31 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7CC |
| Socket | Not recorded | B7G |
| Base pins | Not recorded | 7 |
| 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 12F31 specifications →