Tube cross-reference
6U8A alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6U8A voltage - radio detector converter. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6U8A
The following tubes are recorded as possible replacements for 6U8A. This direction does not establish that 6U8A can replace them.
Voltage - Radio Detector Converter
The database records 6CQ8 as a possible replacement for6U8A.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Tetrode-Triode |
| Base | EIA 9AE | 9GE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Radio Detector Converter
The database records 6EA8 as a possible replacement for6U8A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Radio Detector Converter
The database records 6KD8 as a possible replacement for6U8A.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.4 A |
Voltage - Radio Detector Converter
The database records 6LN8 as a possible replacement for6U8A.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | 9DC |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Triode Pentode
The database records 6MQ8 as a possible replacement for6U8A.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.535 A |
Voltage - Radio Detector Converter
The database records 6U8 as a possible replacement for6U8A.
- Parallel heater circuits only
- No-warmup series circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Where 6U8A can be used as the replacement
In these recorded relationships, 6U8A is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6U8A.
Voltage - Radio Detector Converter
The database records 6U8A as a possible replacement for6678.
No special restrictions are recorded for this substitution.
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | Not recorded |
| Socket | B9A | IO |
| Base pins | 9 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Pentode Sharp Cutoff (single)
The database records 6U8A as a possible replacement for6AX8.
No special restrictions are recorded for this substitution.
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Pentode Sharp Cutoff (single) |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Radio Detector Converter
The database records 6U8A as a possible replacement for6CQ8.
- Not suitable for all circuits
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Tetrode-Triode |
| Base | EIA 9AE | 9GE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Radio Detector Converter
The database records 6U8A as a possible replacement for6EA8.
- Parallel heater circuits only
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Triode Pentode
The database records 6U8A as a possible replacement for6GH8.
No special restrictions are recorded for this substitution.
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage - Triode Pentode
The database records 6U8A as a possible replacement for6GJ8.
- Parallel heater circuits only
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.6 A |
Voltage - Radio Detector Converter
The database records 6U8A as a possible replacement for6KD8.
No special restrictions are recorded for this substitution.
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.4 A |
Voltage - Triode Pentode
The database records 6U8A as a possible replacement for6MQ8.
- Parallel heater circuits only
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Triode Pentode |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.535 A |
Voltage - Radio Detector Converter
The database records 6U8A as a possible replacement for6U8.
No special restrictions are recorded for this substitution.
| Specification | 6U8A replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Radio Detector Converter | Voltage - Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | EIA 9AE | 9AE |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 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 6U8A specifications →