Tube cross-reference
N78 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the N78 power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of N78
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.
6BJ5 Power - Pentode (NOT beam)
- Base
- 6CH
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.64 A
Replacement tubes for N78
The following tubes are recorded as possible replacements for N78. This direction does not establish that N78 can replace them.
Power - Pentode Single (NOT beam) (under 10W)
The database records 6AM5 as a possible replacement forN78.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 6CH |
| Socket | B7G | B7G |
| Base pins | 7 | 6 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.64 A | 0.2 A |
Where N78 can be used as the replacement
In these recorded relationships, N78 is the replacement tube. The listed original tubes are not automatically suitable as replacements for N78.
Voltage Pentode - Remote Cutoff (single)
The database records N78 as a possible replacement for6BJ6.
No special restrictions are recorded for this substitution.
| Specification | N78 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Voltage Pentode - Remote Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7CM |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.64 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 N78 specifications →