{"type_number":"1-V","canonical_url":"https://tubeofile.com/tubes/1-V","manufacturer":"RCA","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"UX4","description":"Indirectly heated half-wave high-vacuum rectifier with coated unipotential cathode. Designed by RCA as a replacement for the mercury-vapor type 1, and is interchangeable with it. Intended for use in AC/DC receivers and small power supplies. ST-12 glass bulb, small 4-pin base (4G basing).","is_directly_heated":false,"completeness":"medium","notes":["The 1-V supersedes the mercury-vapor type 1 and is interchangeable with it.","Indirectly heated: coated unipotential cathode with separate heater.","DC heater-cathode potential must not exceed 500V.","Under no condition of operation should the heater voltage fluctuate beyond 6.3V +/- 10% (max 7.5V).","Typical operation with condenser-input filter: at 117V AC plate (RMS), supply impedance 0 Ohm, DC output current 45 mA max. At 150V AC plate, supply impedance 30 Ohm min, DC output 45 mA max. At 325V AC plate, supply impedance 75 Ohm min, DC output 45 mA max.","When a filter-input condenser larger than 40 uF is used, it may be necessary to use more plate-supply impedance than the minimum value shown to limit peak plate current to 270 mA.","Tube drop approximately 20V at 90 mA DC (per TDSL)."],"references":["https://frank.pocnet.net/sheets/049/1/1V.pdf","https://tdsl.duncanamps.com/show.php?des=1V","https://www.radiomuseum.org/tubes/tube_1v.html"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=1V","radiomuseum":"https://www.radiomuseum.org/tubes/tube_1v.html"},"raw_equivalents":["CV1999","NU-1V","AD","6Z3"],"equivalents":[{"type_number":"6Z3","equivalence_type":"direct","notes":null}],"similar":[],"pins":[{"pin_number":"1","function":"Heater","function_code":"h","notes":null},{"pin_number":"2","function":"Plate (Anode)","function_code":"a","notes":null},{"pin_number":"3","function":"Cathode","function_code":"k","notes":null},{"pin_number":"4","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":"0.3","numeric_value":"0.3","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Rectifier (half-wave)","tube_type_key":"rectifier","specs":[{"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":"Vac_max","display_name":"AC Plate Voltage (RMS, max)","value":"325","numeric_value":"325","unit":"V","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"45","numeric_value":"45","unit":"mA","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"270","numeric_value":"270","unit":"mA","param_group":"rectifier"},{"key":"Rs_min","display_name":"Min Series Resistance (C-input)","value":"75","numeric_value":"75","unit":"Ω","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:49:05.505Z"}