Tube cross-reference
6CQ4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6CQ4 rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6CQ4
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.
6DE4 Rectifier - Damper Diode
- Base
- 4CG
- Socket
- IO
- Base pins
- 5
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 1.6 A
Replacement tubes for 6CQ4
The following tubes are recorded as possible replacements for 6CQ4. This direction does not establish that 6CQ4 can replace them.
Rectifier - Damper Diode
The database records 6DE4 as a possible replacement for6CQ4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.6 A |
Rectifier - Damper Diode
The database records 6DT4 as a possible replacement for6CQ4.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Where 6CQ4 can be used as the replacement
In these recorded relationships, 6CQ4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6CQ4.
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6AU4GT.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | Not recorded |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.8 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6AX4GT.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6AX4GTA.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | Not recorded |
| Socket | B9A | IO |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6AX4GTB.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6BL4.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 8GB |
| Socket | B9A | Not recorded |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 3 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6DA4.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6DA4A.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6DE4.
No special restrictions are recorded for this substitution.
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.6 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6DM4.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4C |
| Socket | B9A | IO |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6DM4A.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6DQ4.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6U4GT.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6W4GT.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | IO |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 A |
Rectifier - Damper Diode
The database records 6CQ4 as a possible replacement for6W4GTA.
- Parallel heater circuits only
| Specification | 6CQ4 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | 4L6 | 4CG |
| Socket | B9A | Not recorded |
| Base pins | 9 | 5 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.6 A | 1.2 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 6CQ4 specifications →