{"type_number":"EL6","canonical_url":"https://tubeofile.com/tubes/EL6","manufacturer":"Philips","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"B8A","description":"AF output power pentode with 18W anode dissipation and very high transconductance; indirect heated. European side-contact base (B8A) with top-cap anode. Developed by Philips, introduced July 1938.","is_directly_heated":false,"completeness":"high","notes":["Uses B8A (Philips side-contact Octal) base with top-cap anode connection. Not compatible with standard Octal (IO) sockets.","Brans Vademecum lists 6GK6 and 6P15 as equivalents, but these use different bases (7-pin miniature and B9A respectively) and are not pin-compatible."],"references":["https://frank.yueksel.org/sheets/005/e/EL6.pdf","https://frank.yueksel.org/sheets/102/e/EL6.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=EL6","radiomuseum":"https://www.radiomuseum.org/tubes/tube_el6.html"},"raw_equivalents":["WE14","EL6E","4699"],"equivalents":[],"similar":[{"type_number":"EL54","reason":"Same electrical structure and characteristics but on P8A (European side-contact with top-cap anode) instead of EL6's B8A (Octal-class side-contact). Not a pin-for-pin drop-in despite identical specs — requires a different socket.","has_detail_page":true}],"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":"Heater","function_code":"h","notes":null},{"pin_number":"4","function":"Cathode","function_code":"k","notes":null},{"pin_number":"5","function":"Suppressor Grid (g3)","function_code":"g3","notes":null},{"pin_number":"6","function":"Control Grid (g1)","function_code":"g1","notes":null},{"pin_number":"7","function":"Screen Grid (g2)","function_code":"g2","notes":null},{"pin_number":"8","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"top","function":"Anode (top cap)","function_code":"a","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":"1.2","numeric_value":"1.2","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":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"275","numeric_value":"275","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"18","numeric_value":"18","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":"90","numeric_value":"90","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"50","numeric_value":"50","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"0.7","numeric_value":"0.7","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","numeric_value":"-7","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"72","numeric_value":"72","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"8","numeric_value":"8","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"20000","numeric_value":"20000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"14.5","numeric_value":"14.5","unit":"mA/V","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"99","numeric_value":"99","unit":"Ω","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"8.2","numeric_value":"8.2","unit":"W","param_group":"output"},{"key":"rl","display_name":"Load Impedance","value":"3500","numeric_value":"3500","unit":"Ω","param_group":"output"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.7","numeric_value":"0.7","unit":"pF","param_group":"capacitances"},{"key":null,"display_name":"Total Harmonic Distortion (PP, full drive)","value":"2.2","numeric_value":"2.2","unit":"%","param_group":null},{"key":null,"display_name":"Output Power (PP Class AB, Va=250V, Vs=265V)","value":"13.3","numeric_value":"13.3","unit":"W","param_group":null},{"key":null,"display_name":"Load Impedance (anode-to-anode, PP)","value":"5000","numeric_value":"5000","unit":"Ω","param_group":null}]}],"synced_at":"2026-04-09T05:18:29.570Z"}