{"type_number":"6GK6","canonical_url":"https://tubeofile.com/tubes/6GK6","manufacturer":"Tung-Sol","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Noval","description":"Power pentode designed for audio output amplifier stages and video power output amplifier stages in television receivers. Features high transconductance (11300 µmhos) and a 9-pin miniature base with low grid-to-plate capacitance (0.14 pF).","is_directly_heated":false,"completeness":"high","notes":["Tung-Sol tentative data sheet (February 1960, Plate #5770). The 6GK6 is described as having an extra reserve of screen dissipation rating and a basing arrangement that gives lower grid-to-plate capacitance compared to prototype tubes.","Maximum plate voltage is 330 V (note A: when heater and positive voltage from storage battery via vibrator, max plate and grid #2 voltages are 275 V and plate dissipation is 9.9 W).","Grid circuit resistance: 0.3 MΩ max for fixed bias, 1.0 MΩ max for self bias.","Maximum cathode current is 65 mA. Maximum grid #2 dissipation is 2 W average, 4 W peak.","Brans Vademecum cross-lists 6GK6 with numerous types in table Vc including 6BQ5/EL84, 6BM5, 6CL6, 6CH6, and 7189A — most are not pin-compatible drop-in substitutes."],"references":["https://frank.pocnet.net/sheets/127/6/6GK6.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6GK6","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6gk6.html"},"raw_equivalents":["6GK6A","8GK6","16GK6","29GK6","5639","5639WA","6CK6"],"equivalents":[{"type_number":"6CK6","equivalence_type":"direct","notes":null},{"type_number":"8GK6","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6BM5","reason":"Similar output pentode but lower transconductance and different pinout","has_detail_page":true},{"type_number":"6BQ5","reason":"Same as EL84 — similar power pentode with different Noval pinout","has_detail_page":false},{"type_number":"6CH6","reason":"Brans cross-lists in same group — similar pentode but verify pinout","has_detail_page":true},{"type_number":"6CL6","reason":"Brans cross-lists in same group — similar pentode but verify pinout before substituting","has_detail_page":true},{"type_number":"EL84","reason":"Functionally similar power pentode but different pinout — not a drop-in substitute","has_detail_page":true}],"pins":[{"pin_number":"1","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"2","function":"Control Grid (g1)","function_code":"g1","notes":null},{"pin_number":"3","function":"Cathode","function_code":"k","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"Screen Grid (g2)","function_code":"g2","notes":null},{"pin_number":"7","function":"Anode (Plate)","function_code":"a","notes":null},{"pin_number":"8","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"9","function":"Suppressor Grid (g3, internally connected to cathode)","function_code":"g3","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":"0.76","numeric_value":"0.76","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Pentode","tube_type_key":"power_pentode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"13.2","numeric_value":"13.2","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"2","numeric_value":"2","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"65","numeric_value":"65","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"100","numeric_value":"100","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":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-7.3","numeric_value":"-7.3","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"48","numeric_value":"48","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"5.5","numeric_value":"5.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"38000","numeric_value":"38000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"11.3","numeric_value":"11.3","unit":"mA/V","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"135","numeric_value":"135","unit":"Ω","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"5.7","numeric_value":"5.7","unit":"W","param_group":"output"},{"key":"rl","display_name":"Load Impedance","value":"5200","numeric_value":"5200","unit":"Ω","param_group":"output"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.14","numeric_value":"0.14","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"10.0","numeric_value":"10","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"7.0","numeric_value":"7","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T19:03:57.931Z"}