{"type_number":"6AS7G","canonical_url":"https://tubeofile.com/tubes/6AS7G","manufacturer":"Tung-Sol","tube_type_key":"power_triode","tube_type_display_name":"Power Triode","base_name":"Octal","description":"Twin power triode in ST-16 glass bulb, designed as a series pass element in electronically regulated power supplies. High perveance permits large currents at low plate voltages for efficient series regulation. 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).","A 30-second cathode warmup time is recommended before plate voltage is applied, especially in circuits where the amplifier tube plate resistor is returned to the plate side of the passing tube.","A grid resistor of 1000 Ω per section is recommended to prevent parasitic oscillation while limiting gas grid current (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.","Brans Vademecum lists CV2623 as the direct equivalent."],"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=6AS7G","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6as7g.html"},"raw_equivalents":["6AS7","6AS7GA","6080","6080WA","6080WB","6520","6N13S","6N13P","6H13C","CV2523","CV2623","CV2984","CV10322","CK6080","E6080","ECC230","A1834","A4475","EI834","RK6080","7802","6N5S"],"equivalents":[{"type_number":"6080","equivalence_type":"direct","notes":null},{"type_number":"6AS7","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":"6336","reason":"Successor design with higher ratings (Va_max 400V, Pa_max 30W) — not a drop-in due to different maximum ratings","has_detail_page":false},{"type_number":"6533","reason":"Higher-current variant listed by RCA as similar — not a drop-in","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":"14","numeric_value":"14","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":"135","numeric_value":"135","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"0","numeric_value":"0","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"125","numeric_value":"125","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":"250","numeric_value":"250","unit":"Ω","param_group":"typical_operating"},{"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":"2026-04-07T19:02:24.808Z"}