{"type_number":"6SL7","canonical_url":"https://tubeofile.com/tubes/6SL7","manufacturer":"RCA","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Octal","description":"High-mu dual triode; indirect heated octal tube. Developed by RCA circa 1941, widely used as a voltage amplifier and phase splitter in hi-fi and instrument applications.","is_directly_heated":false,"completeness":"high","notes":["Developed by RCA circa 1941 as a high-mu companion to the 6SN7 medium-mu dual triode.","The 5691 is a premium long-life version rated for 10,000 hours minimum with matched sections.","The 6113 is a ruggedized military version of the 6SL7GT.","Widely used as a voltage amplifier, phase splitter, and driver stage in hi-fi amplifiers and guitar amplifiers.","The 12SL7GT is the 12.6V heater series-string version."],"references":["https://frank.pocnet.net/sheets/049/6/6SL7GT.pdf","https://tdsl.duncanamps.com/show.php?des=6SL7"],"source_urls":{"r_type":"https://www.radiomuseum.org/tubes/tube_6sl7gt.html","tdsl":"https://tdsl.duncanamps.com/show.php?des=6SL7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6sl7gt.html"},"raw_equivalents":["6SL7GT","6SL7GTY","6SL7A","6SU7","6SU7GTY","6SU7WGT","12SL7GT","5691","6113","6188","6SL7WA","6SL7WGT","ECC35","E438","CV569","CV1984","CV1985","VT-229","14F7","2C52","6N9S","6N9P","6H9C","33S29","B65","3A/154M","41MHF"],"equivalents":[{"type_number":"6SU7","equivalence_type":"direct","notes":null},{"type_number":"ECC35","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"12AT7","reason":"Medium-mu dual triode (mu=60) on Noval base; similar gain range","has_detail_page":true},{"type_number":"12AX7","reason":"High-mu dual triode (mu=100) but Noval base; higher gain, lower current","has_detail_page":true},{"type_number":"6SC7","reason":"High-mu dual triode (mu=70) on Octal base but different pinout (shared cathode)","has_detail_page":true},{"type_number":"6SN7","reason":"Same Octal dual triode pinout but medium-mu (mu=20) vs high-mu (mu=70)","has_detail_page":true},{"type_number":"7F7","reason":"Same electrical characteristics (mu=70, ra=44k) but Loctal base instead of Octal","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Control Grid (section 2)","function_code":"g1_2","notes":null},{"pin_number":"2","function":"Anode (section 2)","function_code":"a2","notes":null},{"pin_number":"3","function":"Cathode (section 2)","function_code":"k2","notes":null},{"pin_number":"4","function":"Control Grid (section 1)","function_code":"g1_1","notes":null},{"pin_number":"5","function":"Anode (section 1)","function_code":"a1","notes":null},{"pin_number":"6","function":"Cathode (section 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":"0.3","numeric_value":"0.3","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode (each section)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"1","numeric_value":"1","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"4","numeric_value":"4","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"90","numeric_value":"90","unit":"V","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":"-2","numeric_value":"-2","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"2.3","numeric_value":"2.3","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"44000","numeric_value":"44000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"1.6","numeric_value":"1.6","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"70","numeric_value":"70","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"2.8","numeric_value":"2.8","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"3.0","numeric_value":"3","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"3.8","numeric_value":"3.8","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:29:16.895Z"}