{"type_number":"323B","canonical_url":"https://tubeofile.com/tubes/323B","manufacturer":"Western Electric","tube_type_key":"thyratron","tube_type_display_name":"Thyratron","base_name":"UY5","description":"Western Electric mercury-vapour thyratron designed for power supply and controlled rectifier service. Directly heated filament cathode with a UY 5-pin base. A high-current gas-filled tube capable of handling significant DC output current. Manufactured by Western Electric and Chatham Electronics.","is_directly_heated":true,"completeness":"high","notes":["Mercury-vapour thyratron: once the grid loses control and the tube fires, the grid cannot regain control until the anode voltage is removed or reversed.","Must be operated within the specified ambient temperature range to ensure correct mercury vapour pressure.","Allow adequate filament warm-up time before applying anode voltage to avoid cathode damage.","The high filament current (7A at 2.5V) indicates a large-cathode, high-current design.","Manufactured by both Western Electric and Chatham Electronics."],"references":["https://frank.pocnet.net/sheets/127/3/323B.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=323B","radiomuseum":"https://www.radiomuseum.org/tubes/tube_323b.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"394A","reason":"Western Electric mercury-vapour thyratron with lower filament current (3.25A vs 7A) and octal base — not pin-compatible","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode (Plate)","function_code":"a","notes":null},{"pin_number":"2","function":"Grid","function_code":"g1","notes":null},{"pin_number":"3","function":"Filament","function_code":"h","notes":null},{"pin_number":"4","function":"Filament","function_code":"h","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","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":"7","numeric_value":"7","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Thyratron","tube_type_key":"thyratron","specs":[]}],"synced_at":"2026-04-07T12:08:57.182Z"}