Tube cross-reference
12FM6 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12FM6 voltage - triode (under 100v). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 12FM6
The following tubes are recorded as possible replacements for 12FM6. This direction does not establish that 12FM6 can replace them.
Voltage - Triode (under 100V)
The database records 12FK6 as a possible replacement for12FM6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (under 100V) | Voltage - Triode (under 100V) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | 7BT | 7BT |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 3 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Where 12FM6 can be used as the replacement
In these recorded relationships, 12FM6 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12FM6.
Voltage - Triode (under 100V)
The database records 12FM6 as a possible replacement for12FK6.
No special restrictions are recorded for this substitution.
| Specification | 12FM6 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (under 100V) | Voltage - Triode (under 100V) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | 7BT | 7BT |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 3 | 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 12FM6 specifications →