{"type_number":"EL2","canonical_url":"https://tubeofile.com/tubes/EL2","manufacturer":"Philips","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"P8A","description":"Output pentode for car radio and battery-operated sets; indirectly heated. Designed for DC series or parallel heater supply at 6.3 V / 0.2 A. Low heater current allows operation from 6 V car batteries. P-base side-contact base.","is_directly_heated":false,"completeness":"high","notes":["Designed for DC series or parallel heater operation from car batteries; suitable for vibrator-type power supplies.","Low heater current (0.2 A) enables direct operation from 6 V accumulators in series with other tubes.","Class A at Va=200V delivers 2.3 W at 10% THD; at Va=250V delivers 3.6 W at 10% THD.","Class AB push-pull at Va=250V delivers 8 W output with two tubes.","Grid resistor max 1 MΩ with automatic bias, max 0.6 MΩ with fixed bias.","Maximum heater-to-cathode voltage is 100 V."],"references":["https://frank.pocnet.net/sheets/030/e/EL2.pdf"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_el2.html"},"raw_equivalents":["CV1429"],"equivalents":[],"similar":[{"type_number":"EL42","reason":"Rimlock successor for car radios with same heater current (0.2 A) — different base, improved performance","has_detail_page":true},{"type_number":"EL95","reason":"Noval successor for low-power automotive/portable use — different base, higher gm","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"2","function":"Cathode","function_code":"k","notes":null},{"pin_number":"3","function":"Heater","function_code":"h","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"6","function":"Metallization (external shield)","function_code":"ia","notes":null},{"pin_number":"7","function":"Suppressor Grid (internally connected to cathode)","function_code":"g3","notes":null},{"pin_number":"8","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"TC","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":"0.2","numeric_value":"0.2","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":"550","numeric_value":"550","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"550","numeric_value":"550","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"8","numeric_value":"8","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"1.6","numeric_value":"1.6","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"45","numeric_value":"45","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","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":"-18","numeric_value":"-18","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"32","numeric_value":"32","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"5","numeric_value":"5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"70000","numeric_value":"70000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"3","numeric_value":"3","unit":"mA/V","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"480","numeric_value":"480","unit":"Ω","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"3.6","numeric_value":"3.6","unit":"W","param_group":"output"},{"key":"rl","display_name":"Load Impedance","value":"8000","numeric_value":"8000","unit":"Ω","param_group":"output"},{"key":null,"display_name":"Screen Voltage (max, operating)","value":"300","numeric_value":"300","unit":"V","param_group":null},{"key":null,"display_name":"Anode Voltage (max, operating)","value":"300","numeric_value":"300","unit":"V","param_group":null}]}],"synced_at":"2026-04-07T12:43:41.736Z"}