{"type_number":"6S41S","canonical_url":"https://tubeofile.com/tubes/6S41S","manufacturer":null,"tube_type_key":"power_triode","tube_type_display_name":"Power Triode","base_name":"Octal","description":"Soviet medium-mu triode (6С41С) designed for use in electronic voltage regulators and as a cathode follower in wideband amplifiers. Large glass Octal envelope with directly heated cathode equivalent. High current capability with low internal resistance. Popular in audiophile single-ended amplifier designs due to its high transconductance and low plate resistance.","is_directly_heated":false,"completeness":"high","notes":["Cyrillic designation: 6С41С. No direct Western equivalent exists.","Originally designed as a series regulator pass tube for voltage stabilizers, but adopted by audiophiles for single-ended amplifier output stages.","Indirectly heated with a heavy-duty cathode capable of high continuous current.","The tube has a relatively low plate resistance making it suitable for direct-coupled cathode follower designs.","Available in standard and ruggedized variants."],"references":["https://www.radiomuseum.org/tubes/tube_6s41s.html"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_6s41s.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"6C33C","reason":"Higher-power Soviet regulator triode — similar application but much higher current capability (up to 600mA)","has_detail_page":true},{"type_number":"6S4S","reason":"Soviet equivalent of 6B4G — different characteristics but similar single power triode concept","has_detail_page":false}],"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","function_code":"a","notes":null},{"pin_number":"4","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"5","function":"Grid","function_code":"g1","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":"3.0","numeric_value":"3","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":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"24","numeric_value":"24","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"200","numeric_value":"200","unit":"mA","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"0.5","numeric_value":"0.5","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"150","numeric_value":"150","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-6","numeric_value":"-6","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"100","numeric_value":"100","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"350","numeric_value":"350","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"12","numeric_value":"12","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"4.2","numeric_value":"4.2","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:28:23.929Z"}