Tube cross-reference
6BC8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6BC8 voltage - dual triode (similar high frequency). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6BC8
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.
6BZ8 Voltage - Dual Triode (similar high frequency)
- Base
- 9AJ
- Socket
- B9A
- Base pins
- 9
- Sections
- 2
- Heater voltage
- 6.3 V
- Heater current
- 0.4 A
Replacement tubes for 6BC8
The following tubes are recorded as possible replacements for 6BC8. This direction does not establish that 6BC8 can replace them.
Voltage - Dual Triode (similar high frequency)
The database records 6BK7 as a possible replacement for6BC8.
- Parallel heater circuits only
| 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.45 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BK7A as a possible replacement for6BC8.
- Parallel heater circuits only
| 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.45 A |
Voltage - Dual Triode (dissimilar)
The database records 6BK7B as a possible replacement for6BC8.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (dissimilar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | 9AJ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.45 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BQ7 as a possible replacement for6BC8.
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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BQ7A as a possible replacement for6BC8.
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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BS8 as a possible replacement for6BC8.
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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BX8 as a possible replacement for6BC8.
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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BZ7 as a possible replacement for6BC8.
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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BZ8 as a possible replacement for6BC8.
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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Where 6BC8 can be used as the replacement
In these recorded relationships, 6BC8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6BC8.
Voltage - Dual Triode (similar high frequency)
The database records 6BC8 as a possible replacement for6BK7.
- Parallel heater circuits only
| Specification | 6BC8 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.45 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BC8 as a possible replacement for6BK7A.
- Parallel heater circuits only
| Specification | 6BC8 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.45 A |
Voltage - Dual Triode (dissimilar)
The database records 6BC8 as a possible replacement for6BK7B.
- Parallel heater circuits only
| Specification | 6BC8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar high frequency) | Voltage - Dual Triode (dissimilar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 9AJ | 9AJ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.45 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BC8 as a possible replacement for6BQ7.
No special restrictions are recorded for this substitution.
| Specification | 6BC8 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BC8 as a possible replacement for6BQ7A.
No special restrictions are recorded for this substitution.
| Specification | 6BC8 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BC8 as a possible replacement for6BS8.
No special restrictions are recorded for this substitution.
| Specification | 6BC8 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BC8 as a possible replacement for6BX8.
No special restrictions are recorded for this substitution.
| Specification | 6BC8 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BC8 as a possible replacement for6BZ7.
No special restrictions are recorded for this substitution.
| Specification | 6BC8 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 A |
Voltage - Dual Triode (similar high frequency)
The database records 6BC8 as a possible replacement for6BZ8.
No special restrictions are recorded for this substitution.
| Specification | 6BC8 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 | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.4 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 6BC8 specifications →