Tube cross-reference
6CL6 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6CL6 voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6CL6
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.
6677 Power - Beam Single (NOT sweep) (under 10W)
- Base
- Not recorded
- Socket
- IO
- Base pins
- 8
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.65 A
Replacement tubes for 6CL6
The following tubes are recorded as possible replacements for 6CL6. This direction does not establish that 6CL6 can replace them.
Power - Pentode Single (NOT beam) (under 10W)
The database records 6L43 as a possible replacement for6CL6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 9BV | S9/12 |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.65 A | 0.65 A |
Power - Pentode Single (NOT beam) (under 10W)
The database records 6197 as a possible replacement for6CL6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 9BV | 9BV |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.65 A | 0.65 A |
Power - Beam Single (NOT sweep) (under 10W)
The database records 6677 as a possible replacement for6CL6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Power - Beam Single (NOT sweep) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 9BV | Not recorded |
| Socket | B9A | IO |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.65 A | 0.65 A |
Where 6CL6 can be used as the replacement
In these recorded relationships, 6CL6 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6CL6.
Power - Pentode Single (NOT beam) (under 10W)
The database records 6CL6 as a possible replacement for6L43.
No special restrictions are recorded for this substitution.
| Specification | 6CL6 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 9BV | S9/12 |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.65 A | 0.65 A |
Power - Beam Single (NOT sweep) (under 10W)
The database records 6CL6 as a possible replacement for6677.
No special restrictions are recorded for this substitution.
| Specification | 6CL6 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Power - Beam Single (NOT sweep) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 9BV | Not recorded |
| Socket | B9A | IO |
| Base pins | 9 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.65 A | 0.65 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 6CL6 specifications →