{"type_number":"5C4S","canonical_url":"https://tubeofile.com/tubes/5C4S","manufacturer":null,"tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"Soviet full-wave high-vacuum rectifier (5Ц4С) with indirectly heated cathode and Octal base. Equivalent to the Western 5Z4G/GZ30. Designed for power supply circuits in radio receivers and amplifiers. Lower current rating than the 5C3S (5U4G equivalent).","is_directly_heated":false,"completeness":"high","notes":["Cyrillic designation: 5Ц4С. Russian_equivalents.json confirms: 5C4S ≈ 5Z4, 5Z4G, GZ30.","Foreign_substitutes.json also lists: 5C4S → 5Z4G, 5Z4.","Indirectly heated cathode — unlike the 5U4G/5C3S which has a directly heated filament. This provides faster warm-up and more consistent operation.","Lower current rating than 5C3S: typically 125mA DC output maximum.","The user listed '5Ц4С' in Cyrillic — this is the same tube as 5C4S in Latin transliteration."],"references":["https://www.radiomuseum.org/tubes/tube_5c4s.html"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_5c4s.html"},"raw_equivalents":["5Z4","5Z4G","5Z4GT","GZ30","CV1863","U52"],"equivalents":[{"type_number":"GZ30","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"5C3S","reason":"Soviet 5U4G equivalent — higher current rating and directly heated filament, different application","has_detail_page":true},{"type_number":"5Y3","reason":"Similar rectifier but directly heated and different voltage/current ratings","has_detail_page":true}],"pins":[{"pin_number":"1","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"4","function":"Anode (plate 1)","function_code":"a1","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"6","function":"Anode (plate 2)","function_code":"a2","notes":null},{"pin_number":"7","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"8","function":"Cathode / Heater","function_code":"k","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":"2.0","numeric_value":"2","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Full-Wave Rectifier","tube_type_key":"rectifier","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"375","numeric_value":"375","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1400","numeric_value":"1400","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"24","numeric_value":"24","unit":"V","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"125","numeric_value":"125","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:50:22.680Z"}