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Electrical Specifications
Rectifier
Peak Inverse VoltagePeak Inverse Voltage700V
Voltage Drop (typical)Forward Voltage Drop30V
Max DC Output Current (total, not per-anode)Max DC Output Current30mA
Heater
Heater VoltageHeater Voltage4V
Notes
French manufacture by SIF (Paris/Malakoff).
European 4-pin B4 base — limited to vintage European equipment.
Low heater current (0.5 A) indicates this is a small-signal rectifier for compact receivers.
Electrical specs (PIV=700V, Ia_max=30mA, Vdrop=30V) are ESTIMATES based on the heater rating and comparable B4 small-signal rectifiers (AZ family). The 1948/49 Taschenbuch zum Röhren-Codex is the original source but not yet consulted directly. Verify against datasheet before using in critical applications.
Pin Layout — B4
1Anode 1 (Plate 1)
2Heater
3Heater
4Anode 2 (Plate 2)
Socket-Compatible Tubes ⚠ Not electrically compatible