Tube cross-reference
7T7 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 7T7 voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 7T7
The following tubes are recorded as possible replacements for 7T7. This direction does not establish that 7T7 can replace them.
Voltage Pentode
The database records 7AG7 as a possible replacement for7T7.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | 8V | 8V |
| Socket | B8G | B8G |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.3 A | 0.16 A |
Voltage Pentode - Sharp Cutoff (single)
The database records 7V7 as a possible replacement for7T7.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | 8V | 8V |
| Socket | B8G | B8G |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.45 A |
Where 7T7 can be used as the replacement
In these recorded relationships, 7T7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 7T7.
Voltage Pentode
The database records 7T7 as a possible replacement for7AG7.
- Parallel heater circuits only
| Specification | 7T7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | 8V | 8V |
| Socket | B8G | B8G |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.3 A | 0.16 A |
Voltage Pentode - Sharp Cutoff (single)
The database records 7T7 as a possible replacement for7V7.
- Parallel heater circuits only
| Specification | 7T7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | 8V | 8V |
| Socket | B8G | B8G |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.45 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 7T7 specifications →