{"type_number":"AZ41","canonical_url":"https://tubeofile.com/tubes/AZ41","manufacturer":"Philips","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Rimlock","description":"Full-wave high-vacuum rectifier with directly heated (filament) cathode. European Rimlock (B8A) base design by Philips. Designed for power supply applications in European radio receivers using 4.0 V heater supply. Compact Rimlock construction replaced earlier side-contact and Octal-based European rectifiers.","is_directly_heated":true,"completeness":"high","notes":["Directly heated (filament cathode) — observe heater warm-up time before applying B+.","4.0 V / 0.12 A heater — designed for European 4 V heater supply standard, not compatible with 5 V or 6.3 V American heater circuits.","Maximum DC output current depends on transformer voltage: 70 mA at 2x300 V, 60 mA at 2x400 V, 60 mA at 2x500 V.","Maximum C-input filter capacitor: 50 µF at 2x300 V and 2x400 V, 50 µF at 2x500 V.","Minimum total series resistance (Rt) per plate: 2x100 Ω at 2x300 V, 2x150 Ω at 2x400 V, 2x200 Ω at 2x500 V.","Rimlock (B8A) base has a locating key for correct insertion — 8 pins arranged in a circle with a central locating spigot.","Peak Inverse Voltage is not explicitly stated in the Telefunken/Philips AZ41 datasheet; PIV=1414 V is derived from the standard full-wave capacitor-input relation PIV = 2 × √2 × Va_max (500 Vrms). Matches the convention used for AZ12, UU4, UU5, EZ41 in this repo.","Vdrop=23 V is read from the AZ41 single-plate I/V characteristic (Philips datasheet page 2, Ia per anode vs Va, 0-60 V / 0-100 mA) at 35 mA per plate (= Idc_max 70 mA / 2 for full-wave). The datasheet does not state a discrete Vdrop value."],"references":["https://frank.pocnet.net/sheets/030/a/AZ41.pdf"],"source_urls":{"r_type":null,"tdsl":"http://tdsl.duncanamps.com/show.php?des=AZ41","radiomuseum":"https://www.radiomuseum.org/tubes/tube_az41.html"},"raw_equivalents":["CV3892"],"equivalents":[],"similar":[{"type_number":"AZ1","reason":"Earlier Philips side-contact rectifier — similar function but different base type, not pin-compatible","has_detail_page":true},{"type_number":"EZ40","reason":"Rimlock rectifier but indirectly heated with 6.3 V heater — different heater voltage, not interchangeable","has_detail_page":true},{"type_number":"EZ41","reason":"Rimlock rectifier but indirectly heated with 6.3 V heater — different heater voltage, not interchangeable","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"3","function":"Filament","function_code":"h","notes":null},{"pin_number":"4","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"6","function":"Anode 2 (Plate 2)","function_code":"a2","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":"4.0","numeric_value":"4","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.12","numeric_value":"0.12","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":"500","numeric_value":"500","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1414","numeric_value":"1414","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"23","numeric_value":"23","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":"70","numeric_value":"70","unit":"mA","param_group":"rectifier"},{"key":"Rs_min","display_name":"Min Series Resistance (C-input)","value":"100","numeric_value":"100","unit":"Ω","param_group":"rectifier"}]}],"synced_at":"2026-04-09T05:18:17.537Z"}