{"type_number":"83V","canonical_url":"https://tubeofile.com/tubes/83V","manufacturer":"Tung-Sol","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"UX4","description":"Full-wave high-vacuum rectifier with indirectly heated unipotential cathode. The vacuum equivalent of the mercury-vapour type 83, designed as a direct replacement without the warm-up delay or temperature sensitivity of mercury types. Higher voltage drop (~23V vs ~15V for the 83) but no risk of arc-back or cathode stripping. UX4 base (4-pin, 4L basing). Electrically identical to the 5V4G on Octal base.","is_directly_heated":false,"completeness":"high","notes":["The Tung-Sol datasheet states: '5V4G and 83V are power rectifiers with low internal voltage drops. They are designed for service in AC operated receivers that require high currents. Their ratings and electrical characteristics are identical.' The 5V4G is the Octal-base version.","High-vacuum type — no warm-up delay required before applying B+ voltage, unlike the mercury-vapour type 83. Safe for immediate operation.","Indirectly heated with unipotential cathode — the 5V heater winding is isolated from the cathode, unlike directly heated rectifiers where the filament IS the cathode.","Voltage drop is approximately 23V at 175 mA (condenser input to filter). Higher than mercury-vapour 83 (~15V) but lower than many other vacuum rectifiers.","With choke input filter: max AC plate voltage increases to 500V RMS (vs 375V RMS with condenser input), same 175 mA DC output.","If filter condensers larger than 40 µF are used, additional plate supply impedance may be necessary.","TDSL confirms CV2547 as a close/identical substitute."],"references":["https://frank.pocnet.net/sheets/127/8/83V.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=83V","radiomuseum":"https://www.radiomuseum.org/tubes/tube_83v.html"},"raw_equivalents":["CV2547","5V4","GZ32"],"equivalents":[{"type_number":"5V4","equivalence_type":"direct","notes":null},{"type_number":"GZ32","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"5Z3","reason":"Same UX4 base, 5V directly heated full-wave rectifier — similar current rating (225 mA) but directly heated with different voltage drop characteristics","has_detail_page":true},{"type_number":"80","reason":"Same UX4 base, high-vacuum full-wave rectifier with 5V filament — but directly heated, lower current rating (125 mA vs 175 mA), higher voltage drop","has_detail_page":true},{"type_number":"83","reason":"Same UX4 base and pin-compatible but mercury-vapour type — lower voltage drop (15V vs 23V), requires 30-60s warm-up before B+, temperature-sensitive. Not a true drop-in due to different characteristics","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"Heater / Cathode common","function_code":"h","notes":null},{"pin_number":"3","function":"Anode 2 (Plate 2)","function_code":"a2","notes":null},{"pin_number":"4","function":"Heater / Cathode common","function_code":"h","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"5.0","numeric_value":"5","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"2.0","numeric_value":"2","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":"375","numeric_value":"375","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1400","numeric_value":"1400","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"23","numeric_value":"23","unit":"V","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"525","numeric_value":"525","unit":"mA","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"175","numeric_value":"175","unit":"mA","param_group":"rectifier"},{"key":"ri","display_name":"Internal Resistance","value":"65","numeric_value":"65","unit":"Ω","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:54:01.130Z"}