Tube cross-reference
FA6 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the FA6 specialized - switching tube. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for FA6
The following tubes are recorded as possible replacements for FA6. This direction does not establish that FA6 can replace them.
Voltage - Triode (single)
The database records 5677 as a possible replacement forFA6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Specialized - Switching Tube | Voltage - Triode (single) |
| Construction | MechanicalVacuumSwitch | Triode |
| Base | Not recorded | 5677 |
| Socket | Not recorded | B5D |
| Base pins | Not recorded | 5 |
| Sections | 1 | 1 |
| Heater voltage | Not recorded | 1.25 V |
| Heater current | Not recorded | 0.06 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 FA6 specifications →