Tube cross-reference
8FQ7 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 8FQ7 voltage - dual triode (similar). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 8FQ7
These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.
8CG7 Voltage - Dual Triode (similar)
- Base
- 9LP
- Socket
- B9A
- Base pins
- 9
- Sections
- 2
- Heater voltage
- 8.4 V
- Heater current
- 0.45 A
Where 8FQ7 can be used as the replacement
In these recorded relationships, 8FQ7 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 8FQ7.
Voltage - Dual Triode (similar)
The database records 8FQ7 as a possible replacement for8CG7.
- Not suitable for all circuits
| Specification | 8FQ7 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9LP | 9LP |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 8.4 V | 8.4 V |
| Heater current | 0.45 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 8FQ7 specifications →