Tube cross-reference
4KN8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 4KN8 voltage - dual triode (similar high frequency). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 4KN8
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.
4RHH8 Voltage - Dual Triode (similar high frequency)
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- 9
- Sections
- 2
- Heater voltage
- 4.2 V
- Heater current
- 0.6 A
Where 4KN8 can be used as the replacement
In these recorded relationships, 4KN8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 4KN8.
Voltage - Dual Triode (similar high frequency)
The database records 4KN8 as a possible replacement for4ES8.
No special restrictions are recorded for this substitution.
| Specification | 4KN8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | Not recorded | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.2 V | 4 V |
| Heater current | 0.6 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 4KN8 specifications →