Tube cross-reference
8MP4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 8MP4 specialized - cathode ray. Compare core specifications and verify every restriction before using a replacement.
Where 8MP4 can be used as the replacement
In these recorded relationships, 8MP4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 8MP4.
Specialized - Cathode Ray
The database records 8MP4 as a possible replacement for8HP4.
No special restrictions are recorded for this substitution.
| Specification | 8MP4 replacement | Original tube |
|---|---|---|
| Tube type | Specialized - Cathode Ray | Specialized - Cathode Ray |
| Construction | CathodeRay | CathodeRay |
| Base | Not recorded | 12L |
| Socket | B12A | DUODECAL5 |
| Base pins | Not recorded | 6 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.6 A | 0.6 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 8MP4 specifications →