{"type_number":"XF184","canonical_url":"https://tubeofile.com/tubes/XF184","manufacturer":"Philips","tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"Noval","description":"Sharp-cutoff IF/RF pentode with frame grid construction, designed for use as IF amplifier in television receivers. High transconductance (15 mA/V) and very low grid-to-anode capacitance (0.005 pF). 600 mA series-heater version of the EF184.","is_directly_heated":false,"completeness":"high","notes":["Series-heater (600 mA) version of the EF184. Electrically identical sections — only the heater voltage/current differs (3.6 V at 600 mA vs 6.3 V at 300 mA).","3EJ7 is the American RETMA designation for the XF184.","Sharp-cutoff pentode — the variable-mu (remote cutoff) equivalent is the EF183/XF183.","Pin 6 is an internal shield (screen) connected internally — must be grounded for proper RF shielding.","Pins 1 and 3 are both cathode connections.","Brans Vademecum also lists YF184 as an equivalent."],"references":["https://frank.pocnet.net/sheets/030/x/XF184.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=XF184","radiomuseum":"https://www.radiomuseum.org/tubes/tube_xf184.html"},"raw_equivalents":["3EJ7"],"equivalents":[],"similar":[{"type_number":"6EJ7","reason":"American designation of EF184 — 6.3 V parallel heater, not series-string compatible","has_detail_page":false},{"type_number":"EF184","reason":"Identical electricals but 6.3 V parallel heater — not a drop-in in series-string heater circuits","has_detail_page":true}],"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":"3.6","numeric_value":"3.6","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.6","numeric_value":"0.6","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":"25","numeric_value":"25","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":"200","numeric_value":"200","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-2.5","numeric_value":"-2.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"10","numeric_value":"10","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"3.8","numeric_value":"3.8","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"350000","numeric_value":"350000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"15","numeric_value":"15","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":"10","numeric_value":"10","unit":"pF","param_group":"capacitances"},{"key":null,"display_name":"Cg1g2 (Grid 1 to Grid 2 Capacitance)","value":"2.8","numeric_value":"2.8","unit":"pF","param_group":null}]},{"section_number":2,"section_label":"Triode Strapped","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode 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":"Ik_max","display_name":"Cathode Current (max)","value":"25","numeric_value":"25","unit":"mA","param_group":"absolute_max"},{"key":"ra","display_name":"Anode Resistance","value":"3700","numeric_value":"3700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"15","numeric_value":"15","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"55","numeric_value":"55","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:53:23.273Z"}