{"type_number":"6C4P","canonical_url":"https://tubeofile.com/tubes/6C4P","manufacturer":null,"tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Noval","description":"Soviet full-wave miniature rectifier (6Ц4П) with indirectly heated cathodes and Noval base. Direct equivalent of the Western 6X4/EZ90. Designed for power supply circuits in compact equipment. Two diode sections with common cathode.","is_directly_heated":false,"completeness":"high","notes":["Cyrillic designation: 6Ц4П. Foreign_substitutes.json confirms: 6C4P → 6X4, 6Z31, EZ90.","Also available as 6C4P-EV (6Ц4П-ЕВ) — military extended-life variant.","From 6X4 Tung-Sol datasheet: Vh=6.3V, Ih=600mA, PIV=1250V, DC output 70mA max per plate.","Tube voltage drop approximately 22V at 70mA per plate.","The 6X4 is identical to the 12X4 except for heater ratings."],"references":["https://frank.pocnet.net/sheets/127/6/6X4.pdf","https://www.radiomuseum.org/tubes/tube_6c4p.html"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_6c4p.html"},"raw_equivalents":["6X4","6X4W","EZ90","6Z31","CV4005"],"equivalents":[{"type_number":"6X4","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"12X4","reason":"12.6V heater version — same electricals but incompatible heater voltage","has_detail_page":true},{"type_number":"6C5S","reason":"Soviet 6X5GT equivalent — similar function but Octal base, not Noval","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Anode (plate 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"3","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"Anode (plate 2)","function_code":"a2","notes":null},{"pin_number":"7","function":"Cathode","function_code":"k","notes":null},{"pin_number":"8","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"9","function":"No Connection","function_code":"nc","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"6.3","numeric_value":"6.3","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.6","numeric_value":"0.6","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Full-Wave Rectifier","tube_type_key":"rectifier","specs":[{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"450","numeric_value":"450","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1250","numeric_value":"1250","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"22","numeric_value":"22","unit":"V","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"70","numeric_value":"70","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:52:15.114Z"}