{"type_number":"EZ80","canonical_url":"https://tubeofile.com/tubes/EZ80","manufacturer":null,"tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Noval","description":"Full-wave vacuum rectifier (double anode) for power supply use in broadcast receivers and domestic audio equipment. Indirectly heated, Noval base.","is_directly_heated":false,"completeness":"high","notes":["A minimum series resistance (protecting resistance) per anode is mandatory to limit surge current when charging the input capacitor. Required values vary with transformer voltage: 125 ohm at 2x250 V, 175 ohm at 2x275 V, 215 ohm at 2x300 V, 300 ohm at 2x350 V.","Pins 2, 6, 8, and 9 are internal connections — do not ground or connect externally.","The EZ81 (6CA4) is pin-compatible but rated at 150 mA — a direct upgrade where more current headroom is needed.","DC output voltage with capacitor-input filter (CL=50 uF) at 90 mA: approximately 260 V at 2x250 Vrms, 285 V at 2x275 Vrms, 310 V at 2x300 Vrms, 360 V at 2x350 Vrms."],"references":["https://frank.pocnet.net/sheets/020/e/EZ80.pdf","https://frank.pocnet.net/sheets/010/e/EZ80.pdf"],"source_urls":{"r_type":"http://www.r-type.org/exhib/aaa0050.htm","tdsl":"http://tdsl.duncanamps.com/show.php?des=EZ80","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ez80.html"},"raw_equivalents":["6V4","CV1535"],"equivalents":[],"similar":[{"type_number":"EZ81","reason":"Pin-compatible Noval rectifier with higher current rating (150 mA vs 90 mA) — direct upgrade, but may affect B+ voltage due to lower internal resistance","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode 1","function_code":"a1","notes":null},{"pin_number":"2","function":"No Connection (internal)","function_code":"ic","notes":null},{"pin_number":"3","function":"Cathode","function_code":"k","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":"Internal Connection","function_code":"ic","notes":null},{"pin_number":"7","function":"Anode 2","function_code":"a2","notes":null},{"pin_number":"8","function":"No Connection (internal)","function_code":"ic","notes":null},{"pin_number":"9","function":"No Connection (internal)","function_code":"ic","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":"Rectifier","tube_type_key":"rectifier","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"350","numeric_value":"350","unit":"V","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"500","numeric_value":"500","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1000","numeric_value":"1000","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"17","numeric_value":"17","unit":"V","param_group":"rectifier"},{"key":"C_max","display_name":"Max C-input Filter Capacitor","value":"50","numeric_value":"50","unit":"µF","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"270","numeric_value":"270","unit":"mA","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"90","numeric_value":"90","unit":"mA","param_group":"rectifier"},{"key":"Rs_min","display_name":"Min Series Resistance (C-input)","value":"300","numeric_value":"300","unit":"Ω","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:55:49.012Z"}