Tube cross-reference
E280F alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the E280F voltage pentode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of E280F
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.
7722 Voltage Pentode
- Base
- 9EQ
- Socket
- B9A
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.32 A
Replacement tubes for E280F
The following tubes are recorded as possible replacements for E280F. This direction does not establish that E280F can replace them.
Voltage Pentode
The database records 7722 as a possible replacement forE280F.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | 9EQ | 9EQ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.315 A | 0.32 A |
Where E280F can be used as the replacement
In these recorded relationships, E280F is the replacement tube. The listed original tubes are not automatically suitable as replacements for E280F.
Voltage Pentode
The database records E280F as a possible replacement for7722.
No special restrictions are recorded for this substitution.
| Specification | E280F replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | 9EQ | 9EQ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.315 A | 0.32 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 E280F specifications →