{"type_number":"EF183","canonical_url":"https://tubeofile.com/tubes/EF183","manufacturer":"Philips","tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"Noval","description":"IF pentode with variable transconductance and frame grid construction, intended for use as IF amplifier in television receivers. Features high gm (12.5 mA/V) and very low grid-to-anode capacitance (0.005 pF).","is_directly_heated":false,"completeness":"high","notes":["Variable-mu (remote cutoff) pentode — not suitable for applications requiring sharp cutoff characteristics. EF184 is the sharp-cutoff equivalent.","Operation with cathode bias resistor and/or screen grid resistor is recommended (per Philips datasheet).","Pin 6 is an internal shield (screen) connected internally — must be grounded for proper RF shielding.","Pins 1 and 3 are both cathode connections.","Vao (anode + screen combined max) is 550 V; Va and Vg2 individual max are 250 V each.","EF811 is listed by TDSL as a substitute with different ratings."],"references":["https://frank.pocnet.net/sheets/010/e/EF183.pdf","https://frank.pocnet.net/sheets/020/e/EF183.pdf"],"source_urls":{"r_type":"http://www.r-type.org/exhib/aaa0362.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=EF183","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ef183.html"},"raw_equivalents":["6EH7","6F29","CV5831"],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"Cathode","function_code":"k","notes":null},{"pin_number":"2","function":"Control Grid","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 Shield","function_code":"ia","notes":null},{"pin_number":"7","function":"Anode","function_code":"a","notes":null},{"pin_number":"8","function":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"9","function":"Suppressor Grid","function_code":"g3","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":"0.3","numeric_value":"0.3","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":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"2.5","numeric_value":"2.5","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"0.65","numeric_value":"0.65","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"20","numeric_value":"20","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"150","numeric_value":"150","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"1","numeric_value":"1","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"200","numeric_value":"200","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"90","numeric_value":"90","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":"12","numeric_value":"12","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"4.5","numeric_value":"4.5","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":"12.5","numeric_value":"12.5","unit":"mA/V","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.005","numeric_value":"0.005","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"9.5","numeric_value":"9.5","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"3","numeric_value":"3","unit":"pF","param_group":"capacitances"},{"key":null,"display_name":"Req (Equivalent Noise Resistance)","value":"490","numeric_value":"490","unit":"Ω","param_group":null},{"key":null,"display_name":"Cg1g2 (Grid 1 to Grid 2 Capacitance)","value":"2.8","numeric_value":"2.8","unit":"pF","param_group":null},{"key":null,"display_name":"Vg1 Peak (max negative)","value":"-50","numeric_value":"-50","unit":"V","param_group":null},{"key":null,"display_name":"Rg3 (Max Grid 3 Resistor)","value":"50","numeric_value":"50","unit":"kΩ","param_group":null},{"key":null,"display_name":"rg1 (Input Resistance at 40 MHz)","value":"13","numeric_value":"13","unit":"kΩ","param_group":null}]}],"synced_at":"2026-04-07T12:40:22.993Z"}