Tube cross-reference
6ST7 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6ST7 voltage - triode (with diode, heptode or hexode). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6ST7
The following tubes are recorded as possible replacements for 6ST7. This direction does not establish that 6ST7 can replace them.
Voltage - Triode (with diode, heptode or hexode)
The database records 6SR7 as a possible replacement for6ST7.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | 8O | 8O |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 3 | 3 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 A | 0.3 A |
Voltage - Triode (with diode, heptode or hexode)
The database records 6SR7GT as a possible replacement for6ST7.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | 8O | 8O |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 3 | 3 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 A | 0.3 A |
Where 6ST7 can be used as the replacement
In these recorded relationships, 6ST7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6ST7.
Voltage - Triode (with diode, heptode or hexode)
The database records 6ST7 as a possible replacement for6SR7.
- Parallel heater circuits only
| Specification | 6ST7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | 8O | 8O |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 3 | 3 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 A | 0.3 A |
Voltage - Triode (with diode, heptode or hexode)
The database records 6ST7 as a possible replacement for6SR7GT.
- Parallel heater circuits only
| Specification | 6ST7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | 8O | 8O |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 3 | 3 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 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 6ST7 specifications →