{"type_number":"6K7","canonical_url":"https://tubeofile.com/tubes/6K7","manufacturer":"Tung-Sol","tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"Octal","description":"Variable-mu (remote cutoff) RF pentode in metal or glass (6K7GT) construction on an Octal base. Designed for use with AVC in RF and IF amplifier stages; the remote-cutoff characteristic minimises cross-modulation. Grid 1 connects via a top cap.","is_directly_heated":false,"completeness":"high","notes":["Grid 1 is brought out to a top cap, not to a base pin. The metal shell (6K7) connects to pin 1 (internal shield).","At Va=250V, Vg2=100V, Vg1=-3V: Ia=7mA, Ig2=1.7mA, Rp=0.8MΩ, Gm=1450 umhos. At Vg2=125V: Ia=10.5mA, Ig2=2.6mA, Rp=0.6MΩ, Gm=1650 umhos.","Maximum plate voltage 300V, maximum screen voltage 125V (supply 500V through dropping resistor), maximum plate dissipation 2.75W, maximum screen dissipation 0.35W.","The 12K7GT is the 12.6V heater version for series-string operation."],"references":["https://frank.pocnet.net/sheets/127/6/6K7.pdf","https://tdsl.duncanamps.com/show.php?des=6K7"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6K7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6k7.html"},"raw_equivalents":["6K7G","6K7GT","6K7GTX","12K7GT","CV1941","CV1943","W63","VT-86"],"equivalents":[],"similar":[{"type_number":"6BA6","reason":"Remote-cutoff pentode with similar function but B7G miniature base — not pin-compatible","has_detail_page":true},{"type_number":"6D6","reason":"Predecessor remote-cutoff RF pentode with similar electricals but 6-pin base — not pin-compatible","has_detail_page":true},{"type_number":"6SK7","reason":"Successor remote-cutoff pentode, same Octal base but single-ended (no top cap), different pinout","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Shell (internal shield)","function_code":"is","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Plate","function_code":"a","notes":null},{"pin_number":"4","function":"Screen Grid (g2)","function_code":"g2","notes":null},{"pin_number":"5","function":"Suppressor Grid (g3)","function_code":"g3","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},{"pin_number":"TC","function":"Control Grid (g1)","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":"Vs_max","display_name":"Screen Voltage (max)","value":"125","numeric_value":"125","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"2.75","numeric_value":"2.75","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"0.35","numeric_value":"0.35","unit":"W","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":"Vs","display_name":"Screen Voltage (typical)","value":"100","numeric_value":"100","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":"mAa","display_name":"Anode Current","value":"7","numeric_value":"7","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"1.7","numeric_value":"1.7","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":"1.45","numeric_value":"1.45","unit":"mA/V","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.005","numeric_value":"0.005","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"7","numeric_value":"7","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"12","numeric_value":"12","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:26:02.615Z"}