Tube cross-reference
3FQ5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 3FQ5 voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 3FQ5
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.
3GK5 Voltage - Triode (single high frequency)
- Base
- 7FP
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 2.8 V
- Heater current
- 0.45 A
Replacement tubes for 3FQ5
The following tubes are recorded as possible replacements for 3FQ5. This direction does not establish that 3FQ5 can replace them.
Voltage - Triode (single high frequency)
The database records 3ES5 as a possible replacement for3FQ5.
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 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 | 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 for3FQ5.
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 3FQ5 can be used as the replacement
In these recorded relationships, 3FQ5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 3FQ5.
Voltage - Triode (single high frequency)
The database records 3FQ5 as a possible replacement for3ER5.
No special restrictions are recorded for this substitution.
| Specification | 3FQ5 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 3FQ5 as a possible replacement for3FH5.
No special restrictions are recorded for this substitution.
| Specification | 3FQ5 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 3FQ5 as a possible replacement for3FQ5A.
No special restrictions are recorded for this substitution.
| Specification | 3FQ5 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 3FQ5 as a possible replacement for3GK5.
No special restrictions are recorded for this substitution.
| Specification | 3FQ5 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 3FQ5 specifications →