Tube cross-reference
5BK7A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5BK7A voltage - dual triode (similar high frequency). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 5BK7A
The following tubes are recorded as possible replacements for 5BK7A. This direction does not establish that 5BK7A can replace them.
Voltage - Dual Triode (similar high frequency)
The database records 4BC8 as a possible replacement for5BK7A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | 9AJ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.2 V |
| Heater current | 0.6 A | 0.6 A |
Voltage - Dual Triode (similar high frequency)
The database records 4BQ7A as a possible replacement for5BK7A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | 9AY |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.2 V |
| Heater current | 0.6 A | 0.6 A |
Voltage - Dual Triode (similar high frequency)
The database records 4BS8 as a possible replacement for5BK7A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.5 V |
| Heater current | 0.6 A | 0.6 A |
Voltage - Dual Triode (similar high frequency)
The database records 4BZ7 as a possible replacement for5BK7A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | 9AJ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.2 V |
| Heater current | 0.6 A | 0.6 A |
Where 5BK7A can be used as the replacement
In these recorded relationships, 5BK7A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 5BK7A.
Voltage - Dual Triode (similar high frequency)
The database records 5BK7A as a possible replacement for4BC8.
No special restrictions are recorded for this substitution.
| Specification | 5BK7A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | 9AJ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.2 V |
| Heater current | 0.6 A | 0.6 A |
Voltage - Dual Triode (similar high frequency)
The database records 5BK7A as a possible replacement for4BQ7A.
No special restrictions are recorded for this substitution.
| Specification | 5BK7A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | 9AY |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.2 V |
| Heater current | 0.6 A | 0.6 A |
Voltage - Dual Triode (similar high frequency)
The database records 5BK7A as a possible replacement for4BS8.
No special restrictions are recorded for this substitution.
| Specification | 5BK7A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.5 V |
| Heater current | 0.6 A | 0.6 A |
Voltage - Dual Triode (similar high frequency)
The database records 5BK7A as a possible replacement for4BZ7.
No special restrictions are recorded for this substitution.
| Specification | 5BK7A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (similar high frequency) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | 9AJ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 4.7 V | 4.2 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 5BK7A specifications →