Tube cross-reference
EM840 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EM840 tuning indicator. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for EM840
The following tubes are recorded as possible replacements for EM840. This direction does not establish that EM840 can replace them.
Tuning Indicator
The database records 6FG6 as a possible replacement forEM840.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | TuningIndicator | Triode-TuningIndicator |
| Base | Not recorded | Not recorded |
| Socket | B9A | B9A |
| Base pins | Not recorded | Not recorded |
| Sections | 1 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.27 A | 0.27 A |
Where EM840 can be used as the replacement
In these recorded relationships, EM840 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EM840.
Tuning Indicator
The database records EM840 as a possible replacement for6FG6.
No special restrictions are recorded for this substitution.
| Specification | EM840 replacement | Original tube |
|---|---|---|
| Tube type | Tuning Indicator | Tuning Indicator |
| Construction | TuningIndicator | Triode-TuningIndicator |
| Base | Not recorded | Not recorded |
| Socket | B9A | B9A |
| Base pins | Not recorded | Not recorded |
| Sections | 1 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.27 A | 0.27 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 EM840 specifications →