{"type_number":"UU6","canonical_url":"https://tubeofile.com/tubes/UU6","manufacturer":"Mazda","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"Half-indirectly heated full-wave vacuum rectifier designed by Mazda (UK) for power supply applications in British radio receivers. Uses a Mazda Octal (MO) base variant.","is_directly_heated":false,"completeness":"high","notes":["Half-indirectly heated cathode.","Before 1951 the UU6 was manufactured with metallising on the bulbs connected to pin 6.","Mazda Octal (MO) base variant — verify pin compatibility with standard International Octal.","Peak Inverse Voltage is not explicitly stated in the Mullard/Mazda UU6 datasheet; PIV=990 V is derived from the standard full-wave capacitor-input relation PIV = 2 × √2 × Va_max (350 Vrms). Matches the convention used for AZ12, UU4, UU5, EZ41 in this repo.","Vdrop ≈ 45V derived from Mazda UU6 datasheet typical-operation table (Vtr=2×350V, Io=120mA → Vo=395V with very low transformer resistance, Cres=8µF). Ideal cap-input peak ≈ 495V; total drop ~100V includes cap-charging regulation; pure tube Vdrop ~45V. Source: Mazda UU6 datasheet."],"references":["https://frank.pocnet.net/sheets/146/u/UU6.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=UU6","radiomuseum":"https://www.radiomuseum.org/tubes/tube_uu6.html"},"raw_equivalents":["CV1413"],"equivalents":[],"similar":[],"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":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"4","function":"Anode 2 (Plate 2)","function_code":"a2","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"6","function":"Metallising (pre-1951)","function_code":"is","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode","function_code":"k","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"4","numeric_value":"4","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"1.4","numeric_value":"1.4","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":"PIV","display_name":"Peak Inverse Voltage","value":"990","numeric_value":"990","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"45","numeric_value":"45","unit":"V","param_group":"rectifier"},{"key":"C_max","display_name":"Max C-input Filter Capacitor","value":"16","numeric_value":"16","unit":"µF","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"120","numeric_value":"120","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-09T05:19:05.260Z"}