Tube cross-reference
EL37 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EL37 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for EL37
The following tubes are recorded as possible replacements for EL37. This direction does not establish that EL37 can replace them.
Power - Beam (NOT sweep)
The database records 6L6 as a possible replacement forEL37.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | Octal | 7AC |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.4 A | 0.9 A |
Where EL37 can be used as the replacement
In these recorded relationships, EL37 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EL37.
Power - Beam (NOT sweep)
The database records EL37 as a possible replacement for5881.
No special restrictions are recorded for this substitution.
| Specification | EL37 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | Octal | T7AC |
| Socket | IO | IO |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.4 A | 0.9 A |
Power - Beam (NOT sweep)
The database records EL37 as a possible replacement for6L6.
No special restrictions are recorded for this substitution.
| Specification | EL37 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Beam (NOT sweep) |
| Construction | Pentode | BeamPower |
| Base | Octal | 7AC |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 1.4 A | 0.9 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 EL37 specifications →