Tube cross-reference
6F8G alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6F8G voltage - dual triode (similar). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6F8G
The following tubes are recorded as possible replacements for 6F8G. This direction does not establish that 6F8G can replace them.
Voltage - Dual Triode (similar)
The database records 6C8G as a possible replacement for6F8G.
- Parallel heater circuits only
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 8G | 8G |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.3 A |
Where 6F8G can be used as the replacement
In these recorded relationships, 6F8G is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6F8G.
Voltage - Dual Triode (similar)
The database records 6F8G as a possible replacement for6C8G.
- Parallel heater circuits only
- Not suitable for all circuits
| Specification | 6F8G replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 8G | 8G |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.3 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 6F8G specifications →