Tube cross-reference
7B4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 7B4 voltage - triode (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 7B4
The following tubes are recorded as possible replacements for 7B4. This direction does not establish that 7B4 can replace them.
7A4
Receiving TubesVoltage - Triode (single)
The database records 7A4 as a possible replacement for7B4.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single) |
| Construction | Triode | Triode |
| Base | 5AC | 5AC |
| Socket | LOCTAL8 | LOCTAL8 |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 7 V | 6.3 V |
| Heater current | 0.32 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 7B4 specifications →