{"type_number":"EL803","canonical_url":"https://tubeofile.com/tubes/EL803","manufacturer":"Philips","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Noval","description":"Power pentode on a Noval (B9A) base, designed for audio output and vertical deflection service. Higher power rating than the EL84 family. Indirectly heated, 6.3V heater.","is_directly_heated":false,"completeness":"medium","notes":["The EL803S is the improved/successor version with identical base and similar ratings.","Brans Vademecum lists equivalents in table Ve: 6CH6, 6CK6, 6CL6, 6GK6, 7AD7, CV5093.","Philips interchange guide suggests EL83 and 6CK6 as replacements.","Sams substitution guide lists 6CK6 as a substitute (with reservations)."],"references":["https://tdsl.duncanamps.com/show.php?des=EL803"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=EL803","radiomuseum":"https://www.radiomuseum.org/tubes/tube_el803.html"},"raw_equivalents":["EL803S","6CK6","6CL6","CV5093"],"equivalents":[{"type_number":"6CK6","equivalence_type":"direct","notes":null},{"type_number":"6CL6","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6CH6","reason":"Similar power pentode on Noval base — listed as equivalent in Brans Vademecum","has_detail_page":true},{"type_number":"6GK6","reason":"Similar power pentode on Noval base — related design but different operating points","has_detail_page":true},{"type_number":"EL83","reason":"Similar power pentode on Noval base — Philips interchange lists as close substitute but different ratings","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Internal Connection","function_code":"ic","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":"Plate","function_code":"a","notes":null},{"pin_number":"8","function":"Suppressor Grid (g3)","function_code":"g3","notes":null},{"pin_number":"9","function":"Internal Connection","function_code":"ic","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":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"9","numeric_value":"9","unit":"W","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":"-7.5","numeric_value":"-7.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"44","numeric_value":"44","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"5","numeric_value":"5","unit":"mA","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"9.0","numeric_value":"9","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"5.5","numeric_value":"5.5","unit":"W","param_group":"output"}]}],"synced_at":"2026-04-07T12:46:34.293Z"}