{"type_number":"84","canonical_url":"https://tubeofile.com/tubes/84","manufacturer":null,"tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"UX5","description":"Full-wave high-vacuum rectifier with indirectly heated unipotential cathode. Designed for use as a power rectifier in storage battery and AC-operated receivers. Uses UX5 (5D) base with 6.3V/0.5A heater. One of the earliest 6.3V-heater rectifiers, originally developed by Sylvania and first marketed by Philco in 1933. Also designated 6Z4.","is_directly_heated":false,"completeness":"high","notes":["Tung-Sol datasheet (1940) confirms: full-wave high vacuum rectifier, 6.3V/0.5A heater (AC or DC), UX5 (5D) base, unipotential cathode.","Rectifier reference confirms: Vdrop=20V, max DC output=60 mA, max AC voltage=325V RMS per plate, 4C base designation (but actually 5-pin per datasheet).","Maximum peak inverse voltage: 1250V.","Maximum DC heater-to-cathode potential: 450V.","Maximum steady-state peak plate current per plate: 180 mA.","With condenser input filter: Va_max=325V RMS, Idc_max=60 mA, effective plate supply impedance=65 ohms per plate.","With choke input filter: Va_max=450V RMS, Idc_max=60 mA, value of input choke minimum 10 henrys.","Tube voltage drop at 60 mA DC per plate: 20V.","MIL-HDBK-213A lists other_number as 6Z4, class description as full wave rectifier.","Originally developed by Sylvania, first marketed by Philco in March 1933. Later manufacture had double brand 84-6Z4.","When filter condensers larger than 40 uF are used, additional plate supply impedance may be necessary."],"references":["https://frank.pocnet.net/sheets/127/8/84.pdf"],"source_urls":{"r_type":null,"tdsl":"http://tdsl.duncanamps.com/show.php?des=84","radiomuseum":"https://www.radiomuseum.org/tubes/tube_84.html"},"raw_equivalents":["6Z4","84/6Z4","6Z4/84","CV619","CV2548","VT-84"],"equivalents":[{"type_number":"6Z4","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6X5GT","reason":"6.3V heater full-wave vacuum rectifier with similar current rating — Octal base, not pin-compatible with UX5","has_detail_page":false},{"type_number":"6ZY5G","reason":"6.3V heater full-wave vacuum rectifier, Octal base — lower current (40 mA) and lower Vdrop (18V)","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Anode 2 (Plate 2)","function_code":"a2","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Cathode","function_code":"k","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":"0.5","numeric_value":"0.5","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":"325","numeric_value":"325","unit":"V","param_group":"absolute_max"},{"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":"20","numeric_value":"20","unit":"V","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"180","numeric_value":"180","unit":"mA","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"60","numeric_value":"60","unit":"mA","param_group":"rectifier"},{"key":"ri","display_name":"Internal Resistance","value":"65","numeric_value":"65","unit":"Ω","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:54:05.444Z"}