{"type_number":"1616","canonical_url":"https://tubeofile.com/tubes/1616","manufacturer":"RCA","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"UX5","description":"Half-wave high-vacuum rectifier with directly heated coated filament. Designed by RCA for high-voltage power supply applications. Uses a Medium 4-Pin Bayonet base with a medium metal top cap for the plate connection. T-16 glass bulb.","is_directly_heated":true,"completeness":"medium","notes":["Base is Medium 4-Pin Bayonet (RCA Socket UT-542-A, Stock No. 9937). Not interchangeable with standard UX4 or Jumbo 4-pin bayonet bases.","The plate connects via a medium metal top cap, not through the base pins. Base pins 1 and 4 are filament; pins 2 and 3 are no connection.","Filament voltage should not deviate more than +/-5% from the rated 2.5V value.","Surge current rating of 2.5A max must not be exceeded during switching operations.","Mounting position: vertical (base down) or horizontal (plate in vertical plane, on edge)."],"references":["https://frank.pocnet.net/sheets/049/1/1616.pdf","https://www.r-type.org/pdfs/1616.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=1616","radiomuseum":"https://www.radiomuseum.org/tubes/tube_1616.html"},"raw_equivalents":["CV656","VT266"],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"Filament","function_code":"h","notes":null},{"pin_number":"2","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"3","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"4","function":"Filament","function_code":"h","notes":null},{"pin_number":"TC","function":"Plate (top cap)","function_code":"a","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"2.5","numeric_value":"2.5","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"5.0","numeric_value":"5","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Rectifier","tube_type_key":"rectifier","specs":[{"key":"PIV","display_name":"Peak Inverse Voltage","value":"5500","numeric_value":"5500","unit":"V","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"800","numeric_value":"800","unit":"mA","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"130","numeric_value":"130","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:49:23.299Z"}