Tube cross-reference
EF80 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EF80 voltage pentode - high frequency (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of EF80
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.
6BX6 Voltage Pentode
- Base
- 9AQ
- Socket
- B9A
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
Replacement tubes for EF80
The following tubes are recorded as possible replacements for EF80. This direction does not establish that EF80 can replace them.
Voltage Pentode
The database records 6BX6 as a possible replacement forEF80.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - High Frequency (single) | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | B9A | 9AQ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where EF80 can be used as the replacement
In these recorded relationships, EF80 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EF80.
Voltage Pentode
The database records EF80 as a possible replacement for6BW7.
No special restrictions are recorded for this substitution.
| Specification | EF80 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - High Frequency (single) | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | B9A | 9AQ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Voltage Pentode
The database records EF80 as a possible replacement for6BX6.
No special restrictions are recorded for this substitution.
| Specification | EF80 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - High Frequency (single) | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | B9A | 9AQ |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 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 EF80 specifications →