Tube cross-reference
6BU8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6BU8 voltage dual pentode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6BU8
The following tubes are recorded as possible replacements for 6BU8. This direction does not establish that 6BU8 can replace them.
Voltage Dual Pentode
The database records 6GS8 as a possible replacement for6BU8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Dual Pentode | Voltage Dual Pentode |
| Construction | Pentode-Pentode | Pentode-Pentode |
| Base | 9FG | 9FG |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Voltage Dual Pentode
The database records 6HS8 as a possible replacement for6BU8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Dual Pentode | Voltage Dual Pentode |
| Construction | Pentode-Pentode | Pentode-Pentode |
| Base | 9FG | 9FC |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where 6BU8 can be used as the replacement
In these recorded relationships, 6BU8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6BU8.
Voltage Dual Pentode
The database records 6BU8 as a possible replacement for6GS8.
No special restrictions are recorded for this substitution.
| Specification | 6BU8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Dual Pentode | Voltage Dual Pentode |
| Construction | Pentode-Pentode | Pentode-Pentode |
| Base | 9FG | 9FG |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Voltage Dual Pentode
The database records 6BU8 as a possible replacement for6HS8.
No special restrictions are recorded for this substitution.
| Specification | 6BU8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Dual Pentode | Voltage Dual Pentode |
| Construction | Pentode-Pentode | Pentode-Pentode |
| Base | 9FG | 9FC |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 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 6BU8 specifications →