Tube cross-reference
6CX8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6CX8 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6CX8
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.
6JA8 Voltage Triode Tetrode
- Base
- 9DX
- Socket
- B9A
- Base pins
- 9
- Sections
- 2
- Heater voltage
- 6.3 V
- Heater current
- 0.75 A
Replacement tubes for 6CX8
The following tubes are recorded as possible replacements for 6CX8. This direction does not establish that 6CX8 can replace them.
Voltage Triode Pentode
The database records 6AU8 as a possible replacement for6CX8.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.45 A |
Voltage Triode Pentode
The database records 6AU8A as a possible replacement for6CX8.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.6 A |
Voltage Triode Pentode
The database records 6AW8 as a possible replacement for6CX8.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.6 A |
Voltage Pentode - Sharp Cutoff (single)
The database records 6AW8A as a possible replacement for6CX8.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.6 A |
Power - Pentode (NOT beam)
The database records 6EB8 as a possible replacement for6CX8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.75 A |
Voltage Triode Pentode
The database records 6GN8 as a possible replacement for6CX8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.75 A |
Voltage Triode Pentode
The database records 6HF8 as a possible replacement for6CX8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.75 A |
Voltage Triode Tetrode
The database records 6JA8 as a possible replacement for6CX8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Tetrode |
| Construction | Pentode-Triode | Tetrode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.75 A |
Power - Pentode (NOT beam)
The database records 6JE8 as a possible replacement for6CX8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.78 A |
Voltage Triode Pentode
The database records 6JV8 as a possible replacement for6CX8.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.6 A |
Where 6CX8 can be used as the replacement
In these recorded relationships, 6CX8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6CX8.
Voltage Triode Pentode
The database records 6CX8 as a possible replacement for6AU8.
- Parallel heater circuits only
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.45 A |
Voltage Triode Pentode
The database records 6CX8 as a possible replacement for6AU8A.
- Parallel heater circuits only
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.6 A |
Power - Pentode (NOT beam)
The database records 6CX8 as a possible replacement for6EB8.
No special restrictions are recorded for this substitution.
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.75 A |
Voltage Triode Pentode
The database records 6CX8 as a possible replacement for6GN8.
No special restrictions are recorded for this substitution.
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.75 A |
Voltage Triode Pentode
The database records 6CX8 as a possible replacement for6HF8.
No special restrictions are recorded for this substitution.
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.75 A |
Voltage Triode Tetrode
The database records 6CX8 as a possible replacement for6JA8.
No special restrictions are recorded for this substitution.
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Tetrode |
| Construction | Pentode-Triode | Tetrode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.75 A |
Voltage Triode Pentode
The database records 6CX8 as a possible replacement for6JV8.
- Parallel heater circuits only
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.6 A |
Voltage Triode Pentode
The database records 6CX8 as a possible replacement for6KS8.
- Parallel heater circuits only
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | B9A |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.6 A |
Voltage Triode Pentode
The database records 6CX8 as a possible replacement for6LF8.
- Parallel heater circuits only
| Specification | 6CX8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | 9DX | 9DX |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.75 A | 0.6 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 6CX8 specifications →