Tube cross-reference
7F8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 7F8 voltage - dual triode (similar high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 7F8
The following tubes are recorded as possible replacements for 7F8. This direction does not establish that 7F8 can replace them.
Voltage - Dual Triode (similar)
The database records 7F8W as a possible replacement for7F8.
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 | 8BW | Not recorded |
| Socket | LOCTAL8 | LOCTAL8 |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 8.3 V | 6.3 V |
| Heater current | 0.3 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 7F8 specifications →