{"type_number":"EL85","canonical_url":"https://tubeofile.com/tubes/EL85","manufacturer":"Philips","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Noval","description":"AF output power pentode; indirectly heated. Developed by Philips/Mullard for use in compact European television and radio receivers. Noval (B9A) base. Designed for relatively low anode dissipation (6 W) with small physical size and low heater current (0.2 A), making it suitable for series-heater and space-constrained designs.","is_directly_heated":false,"completeness":"medium","notes":["Low heater current (0.2 A at 6.3 V) makes this tube suitable for series-string heater designs in AC/DC equipment.","Maximum anode dissipation is 6 W — significantly lower than EL84 (12 W). Designed for compact low-power applications.","Maximum screen voltage is 300 V; maximum anode voltage is 300 V.","The valve_equivalents reference lists numerous 'similar' types including EL42, EL82, EL95, 6CL6, 6AG7, and PL82 — however these are not pin-for-pin equivalents and differ in characteristics.","Philips interchange confirms CV3526 military designation and 6BN5 as the American RETMA equivalent."],"references":["http://tdsl.duncanamps.com/show.php?des=EL85"],"source_urls":{"r_type":null,"tdsl":"http://tdsl.duncanamps.com/show.php?des=EL85","radiomuseum":"https://www.radiomuseum.org/tubes/tube_el85.html"},"raw_equivalents":["6BN5","CV3526","6BM5"],"equivalents":[{"type_number":"6BM5","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"EL42","reason":"Rimlock base predecessor — similar power level but different base type","has_detail_page":true},{"type_number":"EL84","reason":"Higher-powered Noval pentode (12 W vs 6 W Pa_max) with higher heater current (0.76 A vs 0.2 A) — not interchangeable","has_detail_page":true},{"type_number":"EL95","reason":"Similar low-power Noval pentode — different characteristics and pinout, not interchangeable","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Internal Connection","function_code":"ia","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":"Internal Connection","function_code":"ia","notes":null},{"pin_number":"7","function":"Anode (Plate)","function_code":"a","notes":null},{"pin_number":"8","function":"Internal Connection","function_code":"ia","notes":null},{"pin_number":"9","function":"Screen Grid (g2)","function_code":"g2","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":"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":"6","numeric_value":"6","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":"150","numeric_value":"150","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"15","numeric_value":"15","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"50000","numeric_value":"50000","unit":"Ω","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":"2026-04-07T19:08:47.877Z"}