Tube cross-reference
3FQ5A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 3FQ5A voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 3FQ5A
The following tubes are recorded as possible replacements for 3FQ5A. This direction does not establish that 3FQ5A can replace them.
Voltage - Triode (single high frequency)
The database records 3FQ5 as a possible replacement for3FQ5A.
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 | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 2.8 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Triode (single high frequency)
The database records 3GK5 as a possible replacement for3FQ5A.
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 | 2.8 V | 2.8 V |
| Heater current | 0.45 A | 0.45 A |
Where 3FQ5A can be used as the replacement
In these recorded relationships, 3FQ5A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 3FQ5A.
Voltage - Triode (single high frequency)
The database records 3FQ5A as a possible replacement for3ER5.
No special restrictions are recorded for this substitution.
| Specification | 3FQ5A 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 | 2.8 V | 2.8 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Triode (single high frequency)
The database records 3FQ5A as a possible replacement for3FH5.
No special restrictions are recorded for this substitution.
| Specification | 3FQ5A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Triode (single high frequency)
The database records 3FQ5A as a possible replacement for3FQ5.
No special restrictions are recorded for this substitution.
| Specification | 3FQ5A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 2.8 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Triode (single high frequency)
The database records 3FQ5A as a possible replacement for3GK5.
No special restrictions are recorded for this substitution.
| Specification | 3FQ5A 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 | 2.8 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 3FQ5A specifications →