Tube cross-reference
5840 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5840 voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 5840
The following tubes are recorded as possible replacements for 5840. This direction does not establish that 5840 can replace them.
Voltage Pentode - High Frequency (single)
The database records EF732 as a possible replacement for5840.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | 8DL | B8D/F |
| Socket | B8D | WIRE8 |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 A | 0.15 A |
Where 5840 can be used as the replacement
In these recorded relationships, 5840 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 5840.
Voltage Pentode - High Frequency (single)
The database records 5840 as a possible replacement forEF72.
No special restrictions are recorded for this substitution.
| Specification | 5840 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | 8DL | Not recorded |
| Socket | B8D | WIRE8 |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 A | 0.15 A |
Voltage Pentode - High Frequency (single)
The database records 5840 as a possible replacement forEF732.
No special restrictions are recorded for this substitution.
| Specification | 5840 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | 8DL | B8D/F |
| Socket | B8D | WIRE8 |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.15 A | 0.15 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 5840 specifications →