Tube cross-reference
UCH81 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the UCH81 voltage - triode (with diode, heptode or hexode). Compare core specifications and verify every restriction before using a replacement.
Exact variations of UCH81
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.
19D8 Voltage - Triode (with diode, heptode or hexode)
- Base
- Not recorded
- Socket
- B9A
- Base pins
- 9
- Sections
- 2
- Heater voltage
- 19 V
- Heater current
- 0.1 A
Replacement tubes for UCH81
The following tubes are recorded as possible replacements for UCH81. This direction does not establish that UCH81 can replace them.
Voltage - Triode (with diode, heptode or hexode)
The database records 19D8 as a possible replacement forUCH81.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Heptode-Triode | Heptode-Triode |
| Base | 9C13 | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 19 V | 19 V |
| Heater current | 0.1 A | 0.1 A |
Where UCH81 can be used as the replacement
In these recorded relationships, UCH81 is the replacement tube. The listed original tubes are not automatically suitable as replacements for UCH81.
Voltage - Triode (with diode, heptode or hexode)
The database records UCH81 as a possible replacement for19D8.
No special restrictions are recorded for this substitution.
| Specification | UCH81 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Heptode-Triode | Heptode-Triode |
| Base | 9C13 | Not recorded |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 19 V | 19 V |
| Heater current | 0.1 A | 0.1 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 UCH81 specifications →