{"type_number":"EL5G","canonical_url":"https://tubeofile.com/tubes/EL5G","manufacturer":"Philips Australia","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Octal","description":"Output pentode with 18 W anode dissipation; glass envelope variant of the EL5 with International Octal (K8A) base instead of the P8A side-contact base. Manufactured by Philips Australia. Electrically identical to the EL5 but uses the standardized Octal base. Very rare wartime variant.","is_directly_heated":false,"completeness":"medium","notes":["The 'G' suffix indicates glass envelope with Octal (K8A/IO) base — a different base from the standard P8A side-contact EL5.","Valve equivalents reference lists this as a pentode with I/O (International Octal) base and 6.3 V heater.","Anode connection via top cap for high-voltage isolation.","Very rare Australian wartime variant — classified as rare circa 1925-1945 era."],"references":["https://tdsl.duncanamps.com/show.php?des=EL5G","https://www.radiomuseum.org/tubes/?tube=EL5G"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=EL5G","radiomuseum":"https://www.radiomuseum.org/tubes/tube_el5g.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"AL5","reason":"4 V heater version with P8A base — different heater and base","has_detail_page":true},{"type_number":"EL35","reason":"Mullard Octal-base equivalent of EL5 — may have identical pinout","has_detail_page":true},{"type_number":"EL5","reason":"Electrically identical but P8A side-contact base — different base, not pin-compatible","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":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"4","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"5","function":"Cathode","function_code":"k","notes":null},{"pin_number":"6","function":"Suppressor Grid (internally connected to cathode)","function_code":"g3","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Metallization","function_code":"ia","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":"1.35","numeric_value":"1.35","unit":"A","param_group":"heater"},{"key":"Va_max","display_name":"Anode Voltage (max)","value":"275","numeric_value":"275","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":"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":"275","numeric_value":"275","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":"58","numeric_value":"58","unit":"mA","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"8.5","numeric_value":"8.5","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"8.8","numeric_value":"8.8","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":"275","numeric_value":"275","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":"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":"275","numeric_value":"275","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":"58","numeric_value":"58","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"25000","numeric_value":"25000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"8.5","numeric_value":"8.5","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"8.8","numeric_value":"8.8","unit":"W","param_group":"output"}]}],"synced_at":"2026-04-07T12:46:08.421Z"}