Tube cross-reference
4CM4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 4CM4 voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 4CM4
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.
PC86 Voltage - Triode (single high frequency)
- Base
- NOVAL
- Socket
- B9A
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 3.8 V
- Heater current
- 0.3 A
Replacement tubes for 4CM4
The following tubes are recorded as possible replacements for 4CM4. This direction does not establish that 4CM4 can replace them.
Voltage - Triode (single high frequency)
The database records PC86 as a possible replacement for4CM4.
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 | NOVAL |
| Socket | B9A | B9A |
| Base pins | 9 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 4 V | 3.8 V |
| Heater current | 0.3 A | 0.3 A |
Where 4CM4 can be used as the replacement
In these recorded relationships, 4CM4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 4CM4.
Voltage - Triode (single high frequency)
The database records 4CM4 as a possible replacement forPC86.
No special restrictions are recorded for this substitution.
| Specification | 4CM4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | NOVAL |
| Socket | B9A | B9A |
| Base pins | 9 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 4 V | 3.8 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 4CM4 specifications →