Tube cross-reference
6FS5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6FS5 power - beam single (not sweep) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6FS5
The following tubes are recorded as possible replacements for 6FS5. This direction does not establish that 6FS5 can replace them.
Power - Beam Single (NOT sweep) (under 10W)
The database records 6FG5 as a possible replacement for6FS5.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Beam Single (NOT sweep) (under 10W) | Power - Beam Single (NOT sweep) (under 10W) |
| Construction | BeamPower | BeamPower |
| Base | 7GA | Not recorded |
| Socket | B9A | B7G |
| Base pins | 9 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.45 A |
Hexode
The database records 6GU5 as a possible replacement for6FS5.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Beam Single (NOT sweep) (under 10W) | Hexode |
| Construction | BeamPower | Hexode |
| Base | 7GA | Not recorded |
| Socket | B9A | B12C |
| Base pins | 9 | 12 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.22 A |
Where 6FS5 can be used as the replacement
In these recorded relationships, 6FS5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6FS5.
Hexode
The database records 6FS5 as a possible replacement for6GU5.
- Parallel heater circuits only
| Specification | 6FS5 replacement | Original tube |
|---|---|---|
| Tube type | Power - Beam Single (NOT sweep) (under 10W) | Hexode |
| Construction | BeamPower | Hexode |
| Base | 7GA | Not recorded |
| Socket | B9A | B12C |
| Base pins | 9 | 12 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.22 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 6FS5 specifications →