Tube cross-reference
12FX5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12FX5 power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 12FX5
The following tubes are recorded as possible replacements for 12FX5. This direction does not establish that 12FX5 can replace them.
Power - Beam Single (NOT sweep) (under 10W)
The database records 12ED5 as a possible replacement for12FX5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Beam Single (NOT sweep) (under 10W) |
| Construction | Pentode | BeamPower |
| Base | 7CV | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.45 A | 0.15 A |
Power - Pentode Single (NOT beam) (under 10W)
The database records 12EH5 as a possible replacement for12FX5.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 7CV | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.45 A | 0.6 A |
Where 12FX5 can be used as the replacement
In these recorded relationships, 12FX5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12FX5.
Power - Beam Single (NOT sweep) (under 10W)
The database records 12FX5 as a possible replacement for12CA5.
- Parallel heater circuits only
| Specification | 12FX5 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Beam Single (NOT sweep) (under 10W) |
| Construction | Pentode | BeamPower |
| Base | 7CV | 7CV |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.45 A | 0.6 A |
Power - Beam Single (NOT sweep) (under 10W)
The database records 12FX5 as a possible replacement for12ED5.
No special restrictions are recorded for this substitution.
| Specification | 12FX5 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Beam Single (NOT sweep) (under 10W) |
| Construction | Pentode | BeamPower |
| Base | 7CV | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.45 A | 0.15 A |
Power - Pentode Single (NOT beam) (under 10W)
The database records 12FX5 as a possible replacement for12EH5.
- Parallel heater circuits only
| Specification | 12FX5 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 7CV | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.45 A | 0.6 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 12FX5 specifications →