{"type_number":"EL150","canonical_url":"https://tubeofile.com/tubes/EL150","manufacturer":"Telefunken","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Y8A","description":"Indirectly-heated output pentode with Y8A steel base; Telefunken design closely related to the EL12 family. 18 W anode dissipation. Essentially an EL12 variant with specific factory selection. Used in German military and civilian audio equipment from the late 1930s.","is_directly_heated":false,"completeness":"medium","notes":["Closely related to the EL12 family — valve equivalents reference lists it as a pentode with G8A (Y8A steel) base.","The EL150 is normally replaceable with the EL12/350 per Radiomuseum data.","Cathode-bias only — follows the same bias restrictions as the EL12 family.","Referenced in Taschenbuch zum Rohren-Codex 1948/49."],"references":["https://tdsl.duncanamps.com/show.php?des=EL150","https://www.radiomuseum.org/tubes/?tube=EL150"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=EL150","radiomuseum":"https://www.radiomuseum.org/tubes/tube_el150.html"},"raw_equivalents":["EL12/350"],"equivalents":[],"similar":[{"type_number":"EL12","reason":"Near-identical base design — same Y8A base, similar characteristics","has_detail_page":true},{"type_number":"EL12/325","reason":"Similar voltage-selected variant of EL12","has_detail_page":false},{"type_number":"EL12/375","reason":"Higher voltage-rated variant","has_detail_page":true},{"type_number":"EL12N","reason":"Related variant with different maximum ratings","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Suppressor Grid (internally connected to cathode)","function_code":"g3","notes":null},{"pin_number":"2","function":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"3","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"4","function":"Cathode","function_code":"k","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":"Anode","function_code":"a","notes":null},{"pin_number":"8","function":"No Connection","function_code":"nc","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"},{"key":"Va_max","display_name":"Anode Voltage (max)","value":"350","numeric_value":"350","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"350","numeric_value":"350","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":"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":"ra","display_name":"Anode Resistance","value":"30000","numeric_value":"30000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"15","numeric_value":"15","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"8","numeric_value":"8","unit":"W","param_group":"output"}],"sections":[{"section_number":1,"section_label":"Pentode","tube_type_key":"power_pentode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"350","numeric_value":"350","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"350","numeric_value":"350","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":"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":"30000","numeric_value":"30000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"15","numeric_value":"15","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"8","numeric_value":"8","unit":"W","param_group":"output"}]}],"synced_at":"2026-04-07T12:43:27.389Z"}