{"type_number":"5C3S","canonical_url":"https://tubeofile.com/tubes/5C3S","manufacturer":null,"tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"Soviet full-wave vacuum rectifier (5Ц3С in Cyrillic). Directly heated, designed for power supply applications. Functional equivalent of the Western 5U4G with same Octal base.","is_directly_heated":true,"completeness":"high","notes":["5Ц3С (5Ts3S) is the Cyrillic designation. The Latin transliteration is 5C3S.","Directly heated (filament cathode) — observe heater warm-up time before applying B+.","Russian equivalents reference lists Western equivalents as 5AS4A, 5U4G, GZ31.","Commonly found in Soviet audio amplifiers and radio equipment as the primary rectifier tube.","Same Octal base and pinout as 5U4G — widely used as a substitute in Western amplifier restorations."],"references":["https://frank.pocnet.net/sheets/084/5/5C3S.pdf"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_5c3s.html"},"raw_equivalents":["5AS4A"],"equivalents":[],"similar":[{"type_number":"5U4G","reason":"Western functional equivalent with same Octal base — verify heater current compatibility (5C3S draws 3.0A vs 5U4G at 3.0A)","has_detail_page":true},{"type_number":"5Y3GT","reason":"Lower-current rectifier on same Octal base (125 mA vs 225 mA) — not a direct replacement in higher-current circuits","has_detail_page":false},{"type_number":"GZ31","reason":"Philips/Mullard equivalent — same Octal base but verify pinout compatibility","has_detail_page":true}],"pins":[{"pin_number":"1","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"2","function":"Filament","function_code":"h","notes":null},{"pin_number":"3","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"4","function":"Anode 2 (Plate 2)","function_code":"a2","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"6","function":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"7","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"8","function":"Filament","function_code":"h","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"5.0","numeric_value":"5","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"3.0","numeric_value":"3","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Rectifier","tube_type_key":"rectifier","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"450","numeric_value":"450","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1550","numeric_value":"1550","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"44","numeric_value":"44","unit":"V","param_group":"rectifier"},{"key":"C_max","display_name":"Max C-input Filter Capacitor","value":"40","numeric_value":"40","unit":"µF","param_group":"rectifier"},{"key":"Ia_max","display_name":"DC Output Current (max)","value":"225","numeric_value":"225","unit":"mA","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"800","numeric_value":"800","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-07T12:12:32.409Z"}