Tube cross-reference
6CM4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6CM4 voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6CM4
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.
EC86 Voltage - Triode (single high frequency)
- Base
- Not recorded
- Socket
- B9A
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.2 A
Replacement tubes for 6CM4
The following tubes are recorded as possible replacements for 6CM4. This direction does not establish that 6CM4 can replace them.
Voltage - Triode (single high frequency)
The database records E86C as a possible replacement for6CM4.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | Noval |
| Socket | Not recorded | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.17 A | 0.165 A |
Voltage - Triode (single high frequency)
The database records EC806S as a possible replacement for6CM4.
- Parallel heater circuits only
| 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 | Not recorded | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.17 A | 0.165 A |
Voltage - Triode (single high frequency)
The database records EC86 as a possible replacement for6CM4.
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 | Not recorded | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.17 A | 0.2 A |
Where 6CM4 can be used as the replacement
In these recorded relationships, 6CM4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6CM4.
Voltage - Triode (single high frequency)
The database records 6CM4 as a possible replacement forEC806S.
- Parallel heater circuits only
| Specification | 6CM4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.17 A | 0.165 A |
Voltage - Triode (single high frequency)
The database records 6CM4 as a possible replacement forEC86.
No special restrictions are recorded for this substitution.
| Specification | 6CM4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.17 A | 0.2 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 6CM4 specifications →