{"type_number":"6W4","canonical_url":"https://tubeofile.com/tubes/6W4","manufacturer":"Tung-Sol","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"Half-wave high vacuum rectifier with coated unipotential cathode, designed for use as a damping diode in television deflection circuits. May also be used in conventional rectifier applications. Short intermediate shell 6-pin Octal construction.","is_directly_heated":false,"completeness":"high","notes":["Base is 4CG (Short Intermediate Shell 6-Pin Octal). Pins 1, 3, and 8 should not be used as tie points. Pin 2 is an internal connection.","TDSL lists CV732 as a close/identical substitute and 6W4GTA as a different rating/performance substitute. 25W4GT is the series-string heater equivalent (25V).","Brans Vademecum table VIIb cross-lists 6W4 with CV732.","MIL-HDBK-213A classifies as 'Receiving full wave rectifier' and lists 6W4GTA as the other number for 6W4GT. Despite the MIL classification as 'full wave', the 6W4GT is a half-wave rectifier/damper diode.","GE Essential Characteristics lists max plate dissipation as 3.5 W for TV damper service.","The Brans damper group (table VIIb via 6AX4GT) lists many damper types in the same equivalence group including 6AX4GT, 6DE4, 6DQ4, 6U4GT, and 6W4(GT), but these have different PIV ratings and may not be direct substitutes in all circuits.","Heater-cathode voltage limits: 500 V DC (heater negative), 2300 V peak (heater negative), 100 V DC (heater positive), 300 V peak (heater positive)."],"references":["https://frank.pocnet.net/sheets/127/6/6W4GT.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6W4GT","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6w4gt.html"},"raw_equivalents":["6W4GT","6W4GTA","CV732"],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"2","function":"Internal Connection","function_code":"ic","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":"Plate","function_code":"a","notes":null},{"pin_number":"7","function":"Cathode","function_code":"k","notes":null},{"pin_number":"8","function":"No Connection","function_code":"nc","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":"1.2","numeric_value":"1.2","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Damper Diode","tube_type_key":"rectifier","specs":[{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"3.5","numeric_value":"3.5","unit":"W","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"500","numeric_value":"500","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"3850","numeric_value":"3850","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"21","numeric_value":"21","unit":"V","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"125","numeric_value":"125","unit":"mA","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"750","numeric_value":"750","unit":"mA","param_group":"rectifier"},{"key":null,"display_name":"Direct Interelectrode Capacitance: Cathode to Plate and Heater (K to P+H)","value":"13","numeric_value":"13","unit":"pF","param_group":null},{"key":null,"display_name":"Direct Interelectrode Capacitance: Plate to Cathode and Heater (P to K+H)","value":"6.0","numeric_value":"6","unit":"pF","param_group":null},{"key":null,"display_name":"Direct Interelectrode Capacitance: Heater to Cathode (H to K)","value":"7.0","numeric_value":"7","unit":"pF","param_group":null}]}],"synced_at":"2026-04-08T07:53:18.419Z"}