{"type_number":"6FJ7","canonical_url":"https://tubeofile.com/tubes/6FJ7","manufacturer":"RCA","tube_type_key":"compound","tube_type_display_name":"Compound (multi-section)","base_name":"Duodekal","description":"Medium-mu dissimilar dual triode in Duodekar (12-pin) envelope. Section 1 is a medium-mu triode for vertical oscillator. Section 2 is a high-current, low-mu triode for vertical deflection amplifier. Designed for vertical sweep circuits in television receivers.","is_directly_heated":false,"completeness":"high","notes":["Section 1 (vertical oscillator): Va max 350V, Pa max 1W, mu=22.5, gm=2500 umhos, Rp=9000Ω at Va=250V Vg=-8V Ia=8mA.","Section 2 (vertical amplifier): Va max 550V (DC), Pa max 10W, Ik max 150mA peak / 50mA avg, mu=15.4, gm=7700 umhos, Rp=2000Ω at Va=150V Vg=-9.5V.","12-pin small-button Duodecar base (JEDEC E12-70), basing designation 12BM."],"references":["https://frank.pocnet.net/sheets/049/6/6FJ7.pdf","https://tdsl.duncanamps.com/show.php?des=6FJ7"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6FJ7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6fj7.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"6DA7","reason":"Similar dissimilar dual triode for vertical deflection but Noval base — not pin-compatible","has_detail_page":true},{"type_number":"6EM7","reason":"Similar dissimilar dual triode for vertical deflection but Noval base — not pin-compatible","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Heater","function_code":"h","notes":null},{"pin_number":"2","function":"No Internal Connection","function_code":"nc","notes":null},{"pin_number":"3","function":"Grid (Unit 2)","function_code":"g1_2","notes":null},{"pin_number":"4","function":"No Internal Connection (same as pin 2)","function_code":"nc","notes":null},{"pin_number":"5","function":"Anode (Unit 2)","function_code":"a2","notes":null},{"pin_number":"6","function":"Do Not Use","function_code":"nc","notes":null},{"pin_number":"7","function":"Cathode (Unit 2)","function_code":"k2","notes":null},{"pin_number":"8","function":"Heater (same as pin 1)","function_code":"h","notes":null},{"pin_number":"9","function":"Cathode (Unit 1)","function_code":"k1","notes":null},{"pin_number":"10","function":"Grid (Unit 1)","function_code":"g1_1","notes":null},{"pin_number":"11","function":"Anode (Unit 1)","function_code":"a1","notes":null},{"pin_number":"12","function":"Heater","function_code":"h","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":"0.9","numeric_value":"0.9","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode (Unit 1 — oscillator)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"350","numeric_value":"350","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"1","numeric_value":"1","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":"Vg","display_name":"Grid 1 Bias Voltage","value":"-8","numeric_value":"-8","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"8","numeric_value":"8","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"9000","numeric_value":"9000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.5","numeric_value":"2.5","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"22.5","numeric_value":"22.5","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"3.8","numeric_value":"3.8","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"2.2","numeric_value":"2.2","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"0.48","numeric_value":"0.48","unit":"pF","param_group":"capacitances"}]},{"section_number":2,"section_label":"Triode (Unit 2 — amplifier)","tube_type_key":"power_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"550","numeric_value":"550","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"10","numeric_value":"10","unit":"W","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"150","numeric_value":"150","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-9.5","numeric_value":"-9.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"41","numeric_value":"41","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"2000","numeric_value":"2000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"7.7","numeric_value":"7.7","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"15.4","numeric_value":"15.4","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"5","numeric_value":"5","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"4","numeric_value":"4","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"0.54","numeric_value":"0.54","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:23:35.633Z"}