← Browse SIF 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.
Electrical Specifications
Heater
Heater Voltage Heater Voltage 4V
Heater Current Heater Current 0.5A
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. 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