{"type_number":"1641","canonical_url":"https://tubeofile.com/tubes/1641","manufacturer":"Raytheon","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"UX4","description":"Full-wave vacuum rectifier with UX4 base and two top-cap plate connections. Designed by Raytheon as the RK-60 for high-voltage power supply applications. Directly heated filament cathode. Capable of handling up to 1000V RMS per plate with 250 mA DC output.","is_directly_heated":true,"completeness":"medium","notes":["Plates are brought out via two top-cap connections, not through the base pins. The UX4 base carries only the filament. This is unusual for a full-wave rectifier and means the 1641 is not interchangeable with type 80 or other UX4 rectifiers that use base pins for plates.","Originally designated RK-60 by Raytheon; GE marketed the same tube as GL-1641. The military/JAN designation is 1641.","The 596 is a high-altitude (60,000 ft) high-reliability version with slightly higher ratings (PIV 2300V, 275 mA). Pin-compatible but rated for more demanding service conditions.","Requires a 5U4G adapter for use in standard octal rectifier sockets — several aftermarket adapters exist for this purpose."],"references":["https://tdsl.duncanamps.com/show.php?des=1641","https://www.radiomuseum.org/tubes/tube_1641.html","https://www.radiomuseum.org/tubes/tube_rk60.html","https://www.vintelec.com/en/3905-1641.html"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=1641","radiomuseum":"https://www.radiomuseum.org/tubes/tube_1641.html"},"raw_equivalents":["RK60","GL-1641","CV3680"],"equivalents":[],"similar":[{"type_number":"596","reason":"High-altitude/high-reliability version of 1641 with higher PIV (2300V) and current (275 mA) ratings — likely pin-compatible but different electrical limits","has_detail_page":false},{"type_number":"80","reason":"Same UX4 base and 5V filament full-wave rectifier, but plates exit via base pins 2 and 3 instead of top caps — not pin-compatible","has_detail_page":true}],"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":"TC1","function":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"TC2","function":"Anode 2 (Plate 2)","function_code":"a2","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":"3.0","numeric_value":"3","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":"1000","numeric_value":"1000","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"25","numeric_value":"25","unit":"W","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"2120","numeric_value":"2120","unit":"V","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"250","numeric_value":"250","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:49:26.543Z"}