{"type_number":"EL13","canonical_url":"https://tubeofile.com/tubes/EL13","manufacturer":"Telefunken","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Y8A","description":"Output pentode for audio amplifiers. German steel tube with Y8A footless base, introduced by Telefunken in 1949. Lower-power companion to the EL11, with approximately half the anode current and heater consumption. Designed for small domestic receiver output stages.","is_directly_heated":false,"completeness":"medium","notes":["The EL13 is the Y8A steel-tube version of the EL8. Both share identical electrical characteristics but different bases (Y8A vs P8A), so they are not pin-compatible drop-in replacements.","Pin 3 connects cathode and suppressor grid internally. The suppressor grid consists of only two vertical rods bridged above the top mica — a minimal suppressor structure.","The EL42 (Rimlock base) is listed by Radiomuseum as the successor type.","No online datasheets were found for the EL13 specifically. Parameters are sourced from the r-type.org exhibit page. Several universal parameters (Va_max, Vs_max, mAs, ra, Pa_max, Ps_max, Pout, rl, Ik_max, Vhk_max, Rg_max) could not be confirmed from available sources."],"references":["https://www.r-type.org/exhib/aai0177.htm"],"source_urls":{"r_type":"https://www.r-type.org/exhib/aai0177.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=EL13","radiomuseum":"https://www.radiomuseum.org/tubes/tube_el13.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"EL42","reason":"Rimlock base successor type — similar characteristics but different base, not pin-compatible with Y8A","has_detail_page":true},{"type_number":"EL8","reason":"Electrically identical but uses P8A side-contact base — not Y8A","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"2","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"3","function":"Cathode + Suppressor Grid (internally connected)","function_code":"k","notes":null},{"pin_number":"4","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"Heater","function_code":"h","notes":null},{"pin_number":"7","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"8","function":"Anode","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":"0.5","numeric_value":"0.5","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Pentode","tube_type_key":"power_pentode","specs":[{"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":"20","numeric_value":"20","unit":"mA","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"5.5","numeric_value":"5.5","unit":"mA/V","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:43:23.336Z"}