← Browse Marconi-Osram Low quality — significant gaps in core data (missing base, heater, universal parameters, or pins). Treat as a research stub; always cross-reference with datasheets.
Known Equivalents & Substitutes
No known equivalents. If you know of any, use the ⚑ Report Issue button above.
Similar Tubes (Not Drop-In Compatible)
Continental European equivalent rectifier Electrical Specifications
Absolute Maximum
Anode Voltage (max) AC Voltage per Plate (max RMS) 350V
Rectifier
DC Output Current (max) DC Output Current (max) 120mA
Heater
Heater Voltage Heater Voltage 4V
Heater Current Heater Current
Notes
Half-indirectly heated cathode — a design intermediate between direct and fully indirect heating. European 4-pin B4 base limits this to vintage British equipment. Pin Layout — B4
1 2 3 4
1 Anode 1 (Plate 1)
2 Heater
3 Heater
4 Anode 2 (Plate 2)
Socket-Compatible Tubes ⚠ Not electrically compatible