Tube cross-reference
6778 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6778 voltage - triode (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 6778
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.
Replacement tubes for 6778
The following tubes are recorded as possible replacements for 6778. This direction does not establish that 6778 can replace them.
Voltage - Triode (single high frequency)
The database records EC70 as a possible replacement for6778.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (single) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | WIRE8 |
| Base pins | Not recorded | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 A | 0.15 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 6778 specifications →