Tube cross-reference
3BY7 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 3BY7 voltage pentode - remote cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 3BY7
The following tubes are recorded as possible replacements for 3BY7. This direction does not establish that 3BY7 can replace them.
Voltage Pentode - High Frequency (single)
The database records 3BX6 as a possible replacement for3BY7.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B9A | B7G |
| Base pins | 9 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 3.4 V |
| Heater current | 0.6 A | 0.6 A |
Where 3BY7 can be used as the replacement
In these recorded relationships, 3BY7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 3BY7.
Voltage Pentode - High Frequency (single)
The database records 3BY7 as a possible replacement for3BX6.
No special restrictions are recorded for this substitution.
| Specification | 3BY7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | B9A | B7G |
| Base pins | 9 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 3.4 V |
| Heater current | 0.6 A | 0.6 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 3BY7 specifications →