{"type_number":"V41","canonical_url":"https://tubeofile.com/tubes/V41","manufacturer":"SIF","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"B4","description":"Directly heated full-wave vacuum rectifier manufactured by SIF (Societe Independante de Telegraphie sans Fil) of France. Uses the European 4-pin B4 base. A low-current rectifier for small radio receivers.","is_directly_heated":true,"completeness":"low","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."],"references":["https://tdsl.duncanamps.com/show.php?des=V41","https://www.radiomuseum.org/tubes/?tube=V41"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=V41","radiomuseum":"https://www.radiomuseum.org/tubes/tube_v41.html"},"raw_equivalents":[],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Heater","function_code":"h","notes":null},{"pin_number":"4","function":"Anode 2 (Plate 2)","function_code":"a2","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"4","numeric_value":"4","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.5","numeric_value":"0.5","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Rectifier","tube_type_key":"rectifier","specs":[]}],"synced_at":"2026-04-07T12:53:04.677Z"}