{"type_number":"19BY7","canonical_url":"https://tubeofile.com/tubes/19BY7","manufacturer":null,"tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"Noval","description":"Sharp-cutoff RF pentode for series-heater television receivers. 19 V / 100 mA heater for series string operation. Electrically equivalent to the UF85 (European designation). Designed for RF and IF amplifier stages with AGC capability.","is_directly_heated":false,"completeness":"high","notes":["Series heater design: 19 V / 0.1 A for series string operation in AC/DC receivers.","The UF85 is the identical European Mullard/Philips designation."],"references":["https://tdsl.duncanamps.com/show.php?des=19BY7","https://www.radiomuseum.org/tubes/?tube=19BY7"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=19BY7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_19by7.html"},"raw_equivalents":["UF85"],"equivalents":[],"similar":[{"type_number":"EF805S","reason":"Brans lists as equivalent — verify pin compatibility before substituting","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Suppressor Grid (internally connected to cathode)","function_code":"g3","notes":null},{"pin_number":"2","function":"Anode","function_code":"a","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":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"7","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"8","function":"Internal Screen","function_code":"ia","notes":null},{"pin_number":"9","function":"Internal Screen","function_code":"ia","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"19","numeric_value":"19","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.1","numeric_value":"0.1","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Pentode","tube_type_key":"ss_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":"170","numeric_value":"170","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"3.2","numeric_value":"3.2","unit":"W","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"170","numeric_value":"170","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"170","numeric_value":"170","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-2","numeric_value":"-2","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"11","numeric_value":"11","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"500000","numeric_value":"500000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"6.5","numeric_value":"6.5","unit":"mA/V","param_group":"typical_operating"}]}],"synced_at":"2026-04-08T07:49:40.043Z"}