Tube cross-reference
B309 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the B309 voltage - dual triode (similar high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for B309
The following tubes are recorded as possible replacements for B309. This direction does not establish that B309 can replace them.
Voltage - Dual Triode (similar)
The database records 12AT7 as a possible replacement forB309.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | Not recorded | 9A |
| Socket | Not recorded | B9A |
| Base pins | Not recorded | 9 |
| Sections | 2 | 2 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Where B309 can be used as the replacement
In these recorded relationships, B309 is the replacement tube. The listed original tubes are not automatically suitable as replacements for B309.
Voltage - Dual Triode (similar)
The database records B309 as a possible replacement for12AT7.
No special restrictions are recorded for this substitution.
| Specification | B309 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | Not recorded | 9A |
| Socket | Not recorded | B9A |
| Base pins | Not recorded | 9 |
| Sections | 2 | 2 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 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 B309 specifications →