Tube cross-reference
EF73 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EF73 voltage pentode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of EF73
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.
6488 Voltage Pentode - High Frequency (single)
- Base
- 8FX
- Socket
- SUBMINIATURE8
- Base pins
- 8
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.2 A
Replacement tubes for EF73
The following tubes are recorded as possible replacements for EF73. This direction does not establish that EF73 can replace them.
Voltage Pentode - High Frequency (single)
The database records 6488 as a possible replacement forEF73.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 8FX |
| Socket | WIRE8 | SUBMINIATURE8 |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 A |
Where EF73 can be used as the replacement
In these recorded relationships, EF73 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EF73.
Voltage Pentode - High Frequency (single)
The database records EF73 as a possible replacement for6488.
No special restrictions are recorded for this substitution.
| Specification | EF73 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 8FX |
| Socket | WIRE8 | SUBMINIATURE8 |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 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 EF73 specifications →