Tube cross-reference
EY81 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EY81 rectifier - damper diode. Compare core specifications and verify every restriction before using a replacement.
Exact variations of EY81
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.
6R3 Rectifier - Damper Diode
- Base
- Not recorded
- Socket
- B9A
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.81 A
Replacement tubes for EY81
The following tubes are recorded as possible replacements for EY81. This direction does not establish that EY81 can replace them.
Rectifier - Damper Diode
The database records 6R3 as a possible replacement forEY81.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Noval | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.81 A | 0.81 A |
Where EY81 can be used as the replacement
In these recorded relationships, EY81 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EY81.
Rectifier - Damper Diode
The database records EY81 as a possible replacement for6R3.
- Parallel heater circuits only
| Specification | EY81 replacement | Original tube |
|---|---|---|
| Tube type | Rectifier - Damper Diode | Rectifier - Damper Diode |
| Construction | Rectifier | Rectifier |
| Base | Noval | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.81 A | 0.81 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 EY81 specifications →