{"type_number":"6AS7","canonical_url":"https://tubeofile.com/tubes/6AS7","manufacturer":"RCA","tube_type_key":"power_triode","tube_type_display_name":"Power Triode","base_name":"Octal","description":"Twin power triode designed for electronically regulated power supplies. Very low plate resistance (280 Ω) and high plate current capability (125 mA per section) make it ideal as a series pass element. Also widely used in OTL headphone amplifiers and low-impedance audio output stages.","is_directly_heated":false,"completeness":"high","notes":["When multiple tube sections are paralleled for higher current, it is recommended not to exceed 100 mA per plate (Tung-Sol).","Grid circuit resistance limit differs by bias method: 1.0 MΩ for cathode bias, 0.1 MΩ for fixed bias or combination (Tung-Sol).","6080 is the industrial/ruggedized version with tighter parameter tolerances but identical ratings and pinout.","6N13S (6Н13С) is the Soviet equivalent; electrically compatible but may have slightly different capacitance values.","The typical operating point in the Tung-Sol datasheet (Va=135 V, Rk=250 Ω) is for voltage regulator service. Audio use typically runs at higher Va (up to 250 V) as shown in the Svetlana datasheet.","Svetlana rates Pa_max at 13 W per plate vs Tung-Sol's 14 W — use the more conservative 13 W rating for design margin."],"references":["https://frank.pocnet.net/sheets/127/6/6AS7G.pdf","https://frank.pocnet.net/sheets/164/6/6AS7.pdf"],"source_urls":{"r_type":"http://www.r-type.org/exhib/aaa0679.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6AS7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6as7.html"},"raw_equivalents":["6AS7G","6AS7GA","6080","6080WA","6080WB","6520","6N13S","6N13P","6H13C","CV2523","CV2984","CV10322","CK6080","E6080","ECC230","A1834","A4475","EI834","RK6080","7802","6N5S"],"equivalents":[{"type_number":"6080","equivalence_type":"direct","notes":null},{"type_number":"6AS7G","equivalence_type":"direct","notes":null},{"type_number":"6H13C","equivalence_type":"direct","notes":null},{"type_number":"6N13P","equivalence_type":"direct","notes":null},{"type_number":"6N5S","equivalence_type":"direct","notes":null},{"type_number":"7802","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"5998","reason":"Same Octal pinout but ~double the mu (5.4 vs 2.0) and gm (15.5 vs 7.0 mA/V) — changes bias points, not a drop-in","has_detail_page":true},{"type_number":"6533","reason":"RCA lists as similar to 6080/6AS7 — higher-current variant, not a drop-in","has_detail_page":true},{"type_number":"7105","reason":"RCA lists as similar to 6080/6AS7 — verify ratings before substituting","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Grid (triode 2)","function_code":"g1_2","notes":null},{"pin_number":"2","function":"Anode (triode 2)","function_code":"a2","notes":null},{"pin_number":"3","function":"Cathode (triode 2)","function_code":"k2","notes":null},{"pin_number":"4","function":"Grid (triode 1)","function_code":"g1_1","notes":null},{"pin_number":"5","function":"Anode (triode 1)","function_code":"a1","notes":null},{"pin_number":"6","function":"Cathode (triode 1)","function_code":"k1","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Heater","function_code":"h","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":"2.5","numeric_value":"2.5","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode","tube_type_key":"power_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"275","numeric_value":"275","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"13","numeric_value":"13","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"125","numeric_value":"125","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"1.0","numeric_value":"1","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-100","numeric_value":"-100","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"80","numeric_value":"80","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"280","numeric_value":"280","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"7.0","numeric_value":"7","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"2.0","numeric_value":"2","unit":"—","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"1250","numeric_value":"1250","unit":"Ω","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"10","numeric_value":"10","unit":"W","param_group":"output"},{"key":"rl","display_name":"Load Impedance","value":"6000","numeric_value":"6000","unit":"Ω","param_group":"output"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"8.4","numeric_value":"8.4","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"6.2","numeric_value":"6.2","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"2.2","numeric_value":"2.2","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T19:02:18.842Z"}