Tube cross-reference
EF91 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EF91 voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of EF91
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.
6AM6 Voltage Pentode - Sharp Cutoff (single)
- Base
- 7DB
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
6F12 Voltage Pentode - High Frequency (single)
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
Z77 Voltage Radio Detector Converter
- Base
- B7G
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
Replacement tubes for EF91
The following tubes are recorded as possible replacements for EF91. This direction does not establish that EF91 can replace them.
Voltage Pentode - Sharp Cutoff (single)
The database records 6AM6 as a possible replacement forEF91.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | B7G | 7DB |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where EF91 can be used as the replacement
In these recorded relationships, EF91 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EF91.
Specialized - Switching Tube
The database records EF91 as a possible replacement for6024.
No special restrictions are recorded for this substitution.
| Specification | EF91 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Specialized - Switching Tube |
| Construction | Pentode | MicrowaveTRSwitch |
| Base | B7G | Not recorded |
| Socket | B7G | Not recorded |
| Base pins | 7 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | Not recorded |
| Heater current | 0.3 A | Not recorded |
Voltage Pentode - High Frequency (single)
The database records EF91 as a possible replacement for6064.
No special restrictions are recorded for this substitution.
| Specification | EF91 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | B7G | 7EB |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Voltage Pentode - Sharp Cutoff (single)
The database records EF91 as a possible replacement for6AM6.
No special restrictions are recorded for this substitution.
| Specification | EF91 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | B7G | 7DB |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| 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 EF91 specifications →