{"type_number":"6BW4","canonical_url":"https://tubeofile.com/tubes/6BW4","manufacturer":null,"tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Noval","description":"Miniature cathode type full wave rectifier featuring relatively high output current capabilities. Double diode with coated unipotential cathode.","is_directly_heated":false,"completeness":"high","notes":["12BW4 is identical except for heater ratings (12.6V at 0.45A).","Predecessor type is 7Z4 (same function, different base).","May be mounted in any position.","Maximum heater-cathode voltage (heater negative, DC) is 450V — relevant when cathode is elevated above ground potential.","Capacitor-input filter operation requires minimum 82 ohm effective plate supply resistance per plate with 40uF max filter capacitor."],"references":["https://frank.pocnet.net/sheets/127/6/6BW4.pdf"],"source_urls":{"r_type":"https://www.r-type.org/exhib/abg0005.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6BW4","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6bw4.html"},"raw_equivalents":["12BW4"],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"Anode 2","function_code":"a2","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":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"7","function":"Anode 1","function_code":"a1","notes":null},{"pin_number":"8","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"9","function":"Cathode","function_code":"k","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"6.3","numeric_value":"6.3","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.9","numeric_value":"0.9","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":"450","numeric_value":"450","unit":"V","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"450","numeric_value":"450","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1275","numeric_value":"1275","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"40","numeric_value":"40","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":"350","numeric_value":"350","unit":"mA","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"100","numeric_value":"100","unit":"mA","param_group":"rectifier"},{"key":"Rs_min","display_name":"Min Series Resistance (C-input)","value":"82","numeric_value":"82","unit":"Ω","param_group":"rectifier"},{"key":null,"display_name":"Max Transient Peak Plate Current Each Plate","value":"2.0","numeric_value":"2","unit":"A","param_group":null}]}],"synced_at":"2026-04-08T07:52:04.892Z"}