{"type_number":"EZ40","canonical_url":"https://tubeofile.com/tubes/EZ40","manufacturer":"Philips","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Rimlock","description":"Full-wave vacuum rectifier (double anode) for power supply use in broadcast receivers and domestic audio equipment. Indirectly heated, Rimlock base. Predecessor to the EZ80 on the Noval base.","is_directly_heated":false,"completeness":"high","notes":["A minimum series 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 3, 4, and 5 are internal connections — do not ground or connect externally.","The EZ80 (6V4) is the Noval-base successor with identical electrical ratings but different pinout — not pin-compatible.","The maximum permissible transformer voltage of 350 Vrms is the no-load secondary voltage. The heater can be fed from the same transformer winding as other valves due to the high heater-cathode insulation (500 V max).","Warm-up time is approximately 35 seconds, which is longer than typical output valves — this prevents HT from appearing before the other valves are ready to draw current.","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://tube-data.com/sheets/030/e/EZ40.pdf","https://frank.pocnet.net/sheets/046/e/EZ40.pdf"],"source_urls":{"r_type":"http://www.r-type.org/exhib/aaa0818.htm","tdsl":"http://tdsl.duncanamps.com/show.php?des=EZ40","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ez40.html"},"raw_equivalents":["6BT4","CV3891","U150"],"equivalents":[],"similar":[{"type_number":"EZ41","reason":"Same Rimlock base, lower current rating (60 mA vs 90 mA, 2x250 Vrms vs 2x350 Vrms) — EZ40 drops into an EZ41 socket safely (over-rated), but an EZ41 in an EZ40 circuit may exceed its ratings","has_detail_page":true},{"type_number":"EZ80","reason":"Noval-base successor with identical electrical ratings — EZ40 is Rimlock, different pinout","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Heater","function_code":"h","notes":null},{"pin_number":"2","function":"Anode 1","function_code":"a1","notes":null},{"pin_number":"3","function":"Internal Connection","function_code":"ic","notes":null},{"pin_number":"4","function":"Internal Connection","function_code":"ic","notes":null},{"pin_number":"5","function":"Internal Connection","function_code":"ic","notes":null},{"pin_number":"6","function":"Anode 2","function_code":"a2","notes":null},{"pin_number":"7","function":"Cathode","function_code":"k","notes":null},{"pin_number":"8","function":"Heater","function_code":"h","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":"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":"2026-04-22T14:43:22.731Z"}