Tube cross-reference
1C5GT alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1C5GT power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 1C5GT
These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.
DL35 Power - Pentode (NOT beam)
- Base
- Not recorded
- Socket
- IO
- Base pins
- 8
- Sections
- 1
- Heater voltage
- 1.4 V
- Heater current
- 0.1 A
Replacement tubes for 1C5GT
The following tubes are recorded as possible replacements for 1C5GT. This direction does not establish that 1C5GT can replace them.
Power - Pentode (NOT beam)
The database records DL35 as a possible replacement for1C5GT.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | G-6X | Not recorded |
| Socket | IO | IO |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.1 A |
Power - Pentode (NOT beam)
The database records 1C5G as a possible replacement for1C5GT.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | G-6X | G-6X |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.1 A |
Power - Beam (NOT sweep)
The database records 1Q5G as a possible replacement for1C5GT.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | G-6X | Not recorded |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.1 A |
Power - Beam (NOT sweep)
The database records 1Q5GT as a possible replacement for1C5GT.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | G-6X | 6AF |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.1 A |
Power - Beam (NOT sweep)
The database records 1T5GT as a possible replacement for1C5GT.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | G-6X | 6X |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.05 A |
Where 1C5GT can be used as the replacement
In these recorded relationships, 1C5GT is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1C5GT.
Power - Pentode (NOT beam)
The database records 1C5GT as a possible replacement forDL35.
No special restrictions are recorded for this substitution.
| Specification | 1C5GT replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | G-6X | Not recorded |
| Socket | IO | IO |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.1 A |
Power - Pentode (NOT beam)
The database records 1C5GT as a possible replacement for1C5G.
No special restrictions are recorded for this substitution.
| Specification | 1C5GT replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | G-6X | G-6X |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.1 A |
Power - Beam (NOT sweep)
The database records 1C5GT as a possible replacement for1Q5G.
No special restrictions are recorded for this substitution.
| Specification | 1C5GT replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | G-6X | Not recorded |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.1 A |
Power - Beam (NOT sweep)
The database records 1C5GT as a possible replacement for1Q5GT.
No special restrictions are recorded for this substitution.
| Specification | 1C5GT replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | G-6X | 6AF |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.1 A |
Power - Beam (NOT sweep)
The database records 1C5GT as a possible replacement for1T5GT.
- Parallel heater circuits only
| Specification | 1C5GT replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | G-6X | 6X |
| Socket | IO | IO |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.1 A | 0.05 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 1C5GT specifications →