{"type_number":"6SK7","canonical_url":"https://tubeofile.com/tubes/6SK7","manufacturer":null,"tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"Octal","description":"Remote-cutoff (variable-mu) RF pentode in metal shell or glass bulb with Octal base. Designed for RF and IF amplifier service with automatic gain control (AGC). One of the most widely used RF pentodes in AM broadcast receivers.","is_directly_heated":false,"completeness":"medium","notes":["The 6SK7 is one of the most common RF/IF amplifier pentodes in vintage AM receivers. Remote-cutoff characteristic allows smooth AGC action.","GE data: Va max 300V, Vg2 max 150V, Pa max 4W. Typical at Va=250V, Vg2=100V, Vg=-3V: Ia=9.2mA, Ig2=2.6mA, gm=2000 umhos, Rp=800kΩ.","Sams lists 6SK7W as substitute."],"references":["https://frank.pocnet.net/sheets/049/6/6SK7.pdf","https://tdsl.duncanamps.com/show.php?des=6SK7"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6SK7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6sk7.html"},"raw_equivalents":["6SK7GT","6SK7W","6SK7WA","CV1981","VT-117"],"equivalents":[],"similar":[{"type_number":"6BA6","reason":"Miniature (B7G) remote-cutoff pentode — similar function but not pin-compatible","has_detail_page":true},{"type_number":"6BD6","reason":"Miniature (B7G) remote-cutoff pentode with similar electricals — modern replacement but different base","has_detail_page":true},{"type_number":"6K7","reason":"Brans lists as equivalent — earlier remote-cutoff pentode on Octal base","has_detail_page":true},{"type_number":"7B7","reason":"Brans lists as equivalent — Loctal base version","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Shell (Metal type)","function_code":"shell","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":"Grid 2 (Screen)","function_code":"g2","notes":null},{"pin_number":"5","function":"Grid 3 (Suppressor)","function_code":"g3","notes":null},{"pin_number":"6","function":"Cathode","function_code":"k","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Grid 1 (Control Grid)","function_code":"g1","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":"Pentode","tube_type_key":"ss_pentode","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":"4","numeric_value":"4","unit":"W","param_group":"absolute_max"},{"key":"Vg2_max","display_name":"Screen Voltage (max)","value":"150","numeric_value":"150","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":"-3","numeric_value":"-3","unit":"V","param_group":"typical_operating"},{"key":"Vg2","display_name":"Screen Voltage","value":"100","numeric_value":"100","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"9.2","numeric_value":"9.2","unit":"mA","param_group":"typical_operating"},{"key":"mAg2","display_name":"Screen Current","value":"2.6","numeric_value":"2.6","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"800000","numeric_value":"800000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2","numeric_value":"2","unit":"mA/V","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:29:10.729Z"}