Tube cross-reference
8447 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 8447 voltage - triode (with diode, heptode or hexode). Compare core specifications and verify every restriction before using a replacement.
Where 8447 can be used as the replacement
In these recorded relationships, 8447 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 8447.
Voltage - Triode (with diode, heptode or hexode)
The database records 8447 as a possible replacement for12BR7.
No special restrictions are recorded for this substitution.
| Specification | 8447 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (with diode, heptode or hexode) | Voltage - Triode (with diode, heptode or hexode) |
| Construction | Diode-Diode-Triode | Diode-Diode-Triode |
| Base | Not recorded | 9CF |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 3 | 3 |
| Heater voltage | 13.5 V | 12.6 V |
| Heater current | 0.19 A | 0.15 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 8447 specifications →