Tube cross-reference
1F5G alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1F5G power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 1F5G
The following tubes are recorded as possible replacements for 1F5G. This direction does not establish that 1F5G can replace them.
Power - Pentode Single (NOT beam) (under 10W)
The database records KL35 as a possible replacement for1F5G.
- 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 | G-6X | Not recorded |
| Socket | IO | IO |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 2 V | 2 V |
| Heater current | 0.12 A | 0.15 A |
Power - Pentode (NOT beam)
The database records 1L5G as a possible replacement for1F5G.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | G-6X | Not recorded |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2 V | 2 V |
| Heater current | 0.12 A | 0.24 A |
Where 1F5G can be used as the replacement
In these recorded relationships, 1F5G is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1F5G.
Power - Pentode Single (NOT beam) (under 10W)
The database records 1F5G as a possible replacement forKL35.
- Parallel heater circuits only
| Specification | 1F5G replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | G-6X | Not recorded |
| Socket | IO | IO |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 2 V | 2 V |
| Heater current | 0.12 A | 0.15 A |
Power - Pentode (NOT beam)
The database records 1F5G as a possible replacement for1L5G.
- Parallel heater circuits only
| Specification | 1F5G replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | G-6X | Not recorded |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2 V | 2 V |
| Heater current | 0.12 A | 0.24 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 1F5G specifications →