Tube cross-reference
3FY5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 3FY5 voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 3FY5
The following tubes are recorded as possible replacements for 3FY5. This direction does not establish that 3FY5 can replace them.
Voltage - Triode (single high frequency)
The database records 3ER5 as a possible replacement for3FY5.
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 | Not recorded | 7FP |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 3.1 V | 2.8 V |
| Heater current | 0.45 A | 0.45 A |
Where 3FY5 can be used as the replacement
In these recorded relationships, 3FY5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 3FY5.
Voltage - Triode (single high frequency)
The database records 3FY5 as a possible replacement for3ER5.
No special restrictions are recorded for this substitution.
| Specification | 3FY5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | 7FP |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 3.1 V | 2.8 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 3FY5 specifications →