Tube cross-reference
6F4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6F4 voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6F4
The following tubes are recorded as possible replacements for 6F4. This direction does not establish that 6F4 can replace them.
Voltage - Triode (single high frequency)
The database records 6L4 as a possible replacement for6F4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | 7BR | 7BR |
| Socket | Not recorded | B7G |
| Base pins | Not recorded | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.225 A | 0.225 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 6F4 specifications →