Tube cross-reference
7788 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 7788 voltage pentode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 7788
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.
E810F Voltage Pentode
- Base
- NOVAL
- Socket
- B9A
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.34 A
Replacement tubes for 7788
The following tubes are recorded as possible replacements for 7788. This direction does not establish that 7788 can replace them.
Voltage Pentode
The database records E810F as a possible replacement for7788.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | Not recorded | NOVAL |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.34 A | 0.34 A |
Where 7788 can be used as the replacement
In these recorded relationships, 7788 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 7788.
Voltage Pentode
The database records 7788 as a possible replacement forE810F.
No special restrictions are recorded for this substitution.
| Specification | 7788 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | Not recorded | NOVAL |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.34 A | 0.34 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 7788 specifications →