Tube cross-reference
6BK4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6BK4 triode - hv shunt regulator. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6BK4
The following tubes are recorded as possible replacements for 6BK4. This direction does not establish that 6BK4 can replace them.
Triode - HV Shunt Regulator
The database records 6BK4C as a possible replacement for6BK4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Triode - HV Shunt Regulator | Triode - HV Shunt Regulator |
| Construction | Triode | Triode |
| Base | 8GC | SMW |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 A |
Triode - HV Shunt Regulator
The database records 6EL4A as a possible replacement for6BK4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Triode - HV Shunt Regulator | Triode - HV Shunt Regulator |
| Construction | Triode | Triode |
| Base | 8GC | 8GC |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 A |
Triode - HV Shunt Regulator
The database records 6EN4 as a possible replacement for6BK4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Triode - HV Shunt Regulator | Triode - HV Shunt Regulator |
| Construction | Triode | Triode |
| Base | 8GC | 8NJ |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 A |
Where 6BK4 can be used as the replacement
In these recorded relationships, 6BK4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6BK4.
Triode - HV Shunt Regulator
The database records 6BK4 as a possible replacement for6BD4.
- Parallel heater circuits only
- Not suitable for all circuits
| Specification | 6BK4 replacement | Original tube |
|---|---|---|
| Tube type | Triode - HV Shunt Regulator | Triode - HV Shunt Regulator |
| Construction | Triode | Triode |
| Base | 8GC | 6BD4 |
| Socket | IO | B7G |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.6 A |
Triode - HV Shunt Regulator
The database records 6BK4 as a possible replacement for6BD4A.
- Parallel heater circuits only
- Not suitable for all circuits
| Specification | 6BK4 replacement | Original tube |
|---|---|---|
| Tube type | Triode - HV Shunt Regulator | Triode - HV Shunt Regulator |
| Construction | Triode | Triode |
| Base | 8GC | 6BD4 |
| Socket | IO | B7G |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 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 6BK4 specifications →