Tube cross-reference
5691 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 5691 voltage - dual triode (similar). Compare core specifications and verify every restriction before using a replacement.
Where 5691 can be used as the replacement
In these recorded relationships, 5691 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 5691.
6SL7
Receiving To Industrial TubesVoltage - Dual Triode (similar)
The database records 5691 as a possible replacement for6SL7.
- Parallel heater circuits only
| Specification | 5691 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Dual Triode (similar) | Voltage - Dual Triode (similar) |
| Construction | Triode-Triode | Triode-Triode |
| Base | 8BO | Not recorded |
| Socket | IO | IO |
| Base pins | 8 | Not recorded |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 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 5691 specifications →