Tube cross-reference
4HQ5 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 4HQ5 voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 4HQ5
The following tubes are recorded as possible replacements for 4HQ5. This direction does not establish that 4HQ5 can replace them.
Voltage - Triode (single high frequency)
The database records 4HA5 as a possible replacement for4HQ5.
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 | 7FP | 7GM |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 4.2 V | 3.8 V |
| Heater current | 0.3 A | 0.3 A |
Voltage - Triode (single high frequency)
The database records 4HM5 as a possible replacement for4HQ5.
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 | 7FP | 7GM |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 4.2 V | 4 V |
| Heater current | 0.3 A | 0.3 A |
Where 4HQ5 can be used as the replacement
In these recorded relationships, 4HQ5 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 4HQ5.
Voltage - Triode (single high frequency)
The database records 4HQ5 as a possible replacement for4HA5.
No special restrictions are recorded for this substitution.
| Specification | 4HQ5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | 7FP | 7GM |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 4.2 V | 3.8 V |
| Heater current | 0.3 A | 0.3 A |
Voltage - Triode (single high frequency)
The database records 4HQ5 as a possible replacement for4HM5.
No special restrictions are recorded for this substitution.
| Specification | 4HQ5 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | 7FP | 7GM |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 4.2 V | 4 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 4HQ5 specifications →