{"type_number":"6X5","canonical_url":"https://tubeofile.com/tubes/6X5","manufacturer":null,"tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"Indirectly-heated full-wave vacuum rectifier designed for power supply applications in radio receivers and audio equipment. Features a unipotential cathode with high heater-to-cathode voltage tolerance (450 V), permitting the heater to be powered from a common 6.3 V winding shared with other tubes.","is_directly_heated":false,"completeness":"high","notes":["Indirectly heated (unipotential cathode on pin 8, separate from heater on pins 2 and 7). Unlike directly-heated rectifiers such as 5U4G or 5Y3, the 6X5 can share a common 6.3 V heater winding with signal tubes because heater-to-cathode insulation is rated at 450 Vdc.","Maximum DC output current is only 70 mA — significantly lower than 5-volt rectifiers like 5U4G (225 mA) or 5V4 (175 mA). Verify total B+ current draw before substituting.","The 6X5 was historically prone to internal short circuits between heater and cathode, especially early production units. Later GT and GT/G versions improved reliability. Use a fuse or current-limiting resistor in the B+ line as a precaution.","5852 (Bendix) is a ruggedized military-grade version — electrically identical but built for extended life.","6Z5P (Russian) and 6C5S (Russian) are functional equivalents but may have slightly different internal construction. Pin-compatible.","Brans lists 6AX5GT as equivalent; it has slightly different heater warm-up characteristics but same electrical ratings and Octal pinout."],"references":["https://frank.pocnet.net/sheets/093/6/6X5GT.pdf","https://frank.pocnet.net/sheets/127/6/6X5.pdf"],"source_urls":{"r_type":"https://www.r-type.org/exhib/aai0172.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6X5GT","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6x5.html"},"raw_equivalents":["6X5G","6X5GT","6X5GT/G","EZ35","CV574","6C5S","6Z5P","U70","U147","VT-126B","5852","CV573","6X5WGT","6AX5GT","6AX5","6W5-G","6W5G"],"equivalents":[{"type_number":"5852","equivalence_type":"direct","notes":null},{"type_number":"6AX5","equivalence_type":"direct","notes":null},{"type_number":"6W5-G","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6X4","reason":"Same function (full-wave rectifier, 6.3V heater, 70mA) but B7G miniature base — not pin-compatible with Octal","has_detail_page":true}],"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":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"4","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"5","function":"Anode 2 (Plate 2)","function_code":"a2","notes":null},{"pin_number":"6","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","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":"0.6","numeric_value":"0.6","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":"325","numeric_value":"325","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":"1250","numeric_value":"1250","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"22","numeric_value":"22","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":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"70","numeric_value":"70","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-09T05:17:24.985Z"}