{"type_number":"GZ32","canonical_url":"https://tubeofile.com/tubes/GZ32","manufacturer":"Philips","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"High-vacuum full-wave rectifier with indirectly heated cathode. Designed for power supply applications in audio amplifiers, small transmitters, and industrial equipment. Features parallel heater supply and unipotential cathode.","is_directly_heated":false,"completeness":"high","notes":["Indirectly heated (unipotential cathode) — provides controlled warm-up and reduced stress on filter capacitors compared to directly-heated rectifiers.","Capacitor-input filter requires minimum series resistance (Rt) that increases with capacitor value: 50 ohm for 16 µF, 100 ohm for 32 µF, 150 ohm for 60 µF.","Maximum DC output current depends on operating mode and AC input voltage: 300 mA at 2x300V (C-input), 250 mA at 2x350V (C-input), 125 mA at 2x500V (C-input), or up to 300 mA at 2x400V (choke-input).","The 5V4G/5V4GA is the American equivalent. Pin-compatible and electrically identical, though some American datasheets rate max DC output at 175 mA (capacitor-input) vs the Philips 125–300 mA rating which varies by applied voltage.","52KU is the Cossor designation for the same tube."],"references":["https://frank.pocnet.net/sheets/030/g/GZ32.pdf","https://frank.pocnet.net/sheets/049/5/5V4GA.pdf"],"source_urls":{"r_type":"http://www.r-type.org/exhib/aad0204.htm","tdsl":"http://tdsl.duncanamps.com/show.php?des=GZ32","radiomuseum":"https://www.radiomuseum.org/tubes/tube_gz32.html"},"raw_equivalents":["5V4G","5V4GA","5AQ4","CV593","CV2748","52KU","83V","5V4"],"equivalents":[{"type_number":"5V4","equivalence_type":"direct","notes":null},{"type_number":"83V","equivalence_type":"direct","notes":null}],"similar":[],"pins":[{"pin_number":"1","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"4","function":"Anode 2 (Plate 2)","function_code":"a2","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"6","function":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"7","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"8","function":"Heater / Cathode","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":"500","numeric_value":"500","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":"25","numeric_value":"25","unit":"V","param_group":"rectifier"},{"key":"C_max","display_name":"Max C-input Filter Capacitor","value":"60","numeric_value":"60","unit":"µF","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":"300","numeric_value":"300","unit":"mA","param_group":"rectifier"},{"key":"Rs_min","display_name":"Min Series Resistance (C-input)","value":"150","numeric_value":"150","unit":"Ω","param_group":"rectifier"}]}],"synced_at":"2026-04-08T07:56:06.361Z"}