{"type_number":"5T4","canonical_url":"https://tubeofile.com/tubes/5T4","manufacturer":null,"tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"Full-wave high-vacuum rectifier with directly heated (filament) cathode in a metal-shell envelope. Designed for high-current power supply applications in AC-operated receivers. Octal base (5T basing). Electrically similar to the 5U4G but in a metal envelope with lower filament current draw.","is_directly_heated":true,"completeness":"high","notes":["Directly heated (filament cathode) — observe heater warm-up time before applying B+ to protect the tube and filter capacitors.","Metal-shell envelope provides built-in shielding — the shell is internally connected to pin 1 (ground).","Voltage drop of 45 V at 225 mA DC per plate.","With capacitor-input filter: max 450 V RMS per plate, 225 mA DC output, 150 Ω total effective plate supply impedance per plate.","With choke-input filter: max 550 V RMS per plate, 225 mA DC output, min 3 H input choke.","When filter condensers larger than 40 µF are used, it may be necessary to add additional plate supply impedance."],"references":["https://frank.pocnet.net/sheets/127/5/5T4.pdf"],"source_urls":{"r_type":null,"tdsl":"http://tdsl.duncanamps.com/show.php?des=5T4","radiomuseum":"https://www.radiomuseum.org/tubes/tube_5t4.html"},"raw_equivalents":["CV1846","VT-114"],"equivalents":[],"similar":[{"type_number":"5R4GY","reason":"Same Octal base, higher voltage rating (750 V vs 450/550 V) but higher Vdrop (67 V vs 45 V)","has_detail_page":false},{"type_number":"5U4G","reason":"Same Octal base and pinout, same max voltage — 5U4G has higher filament current (3.0 A vs 2.0 A) and slightly different Vdrop characteristics","has_detail_page":true},{"type_number":"5X4G","reason":"Electrically similar but different Octal pinout (5Q vs 5T basing)","has_detail_page":false},{"type_number":"GZ34","reason":"Philips interchange lists GZ34/5AR4 as replacement — much lower Vdrop but indirectly heated; verify circuit compatibility","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Shell (Ground)","function_code":"is","notes":null},{"pin_number":"2","function":"Filament","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":"Filament","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":"550","numeric_value":"550","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1550","numeric_value":"1550","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"45","numeric_value":"45","unit":"V","param_group":"rectifier"},{"key":"C_max","display_name":"Max C-input Filter Capacitor","value":"40","numeric_value":"40","unit":"µF","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"675","numeric_value":"675","unit":"mA","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"225","numeric_value":"225","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":"2026-04-08T07:50:37.198Z"}