Tube cross-reference
1A5G alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1A5G power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 1A5G
The following tubes are recorded as possible replacements for 1A5G. This direction does not establish that 1A5G can replace them.
Power - Pentode (NOT beam)
The database records 1A5GT as a possible replacement for1A5G.
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 | Not recorded | 6X |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Power - Beam (NOT sweep)
The database records 1T5GT as a possible replacement for1A5G.
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 | Not recorded | 6X |
| Socket | IO | IO |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Where 1A5G can be used as the replacement
In these recorded relationships, 1A5G is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1A5G.
Power - Pentode (NOT beam)
The database records 1A5G as a possible replacement for1A5GT.
No special restrictions are recorded for this substitution.
| Specification | 1A5G replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 6X |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Power - Beam (NOT sweep)
The database records 1A5G as a possible replacement for1T5GT.
No special restrictions are recorded for this substitution.
| Specification | 1A5G replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | Not recorded | 6X |
| Socket | IO | IO |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 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 1A5G specifications →