Tube cross-reference
6678 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6678 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6678
The following tubes are recorded as possible replacements for 6678. This direction does not establish that 6678 can replace them.
Voltage Radio Detector Converter
The database records 6U8A as a possible replacement for6678.
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 | Not recorded | EIA 9AE |
| Socket | IO | B9A |
| Base pins | 8 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Where 6678 can be used as the replacement
In these recorded relationships, 6678 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6678.
Voltage Radio Detector Converter
The database records 6678 as a possible replacement for6U8.
No special restrictions are recorded for this substitution.
| Specification | 6678 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Radio Detector Converter |
| Construction | Pentode-Triode | Pentode-Triode |
| Base | Not recorded | 9AE |
| Socket | IO | B9A |
| Base pins | 8 | 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 6678 specifications →