{"type_number":"6AU7","canonical_url":"https://tubeofile.com/tubes/6AU7","manufacturer":"Tung-Sol","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Medium-mu twin triode in Noval (9-pin miniature) construction. Except for heater ratings and warm-up time, the 6AU7 is identical to the 12AU7A. Intended for use in 600mA series-heater TV applications. 6.3V/0.3A heater in series, 3.15V/0.6A in parallel.","is_directly_heated":false,"completeness":"high","notes":["From Tung-Sol datasheet: 'Except for heater ratings and heater warm-up time, the 6AU7 is identical to the 12AU7.'","Heater: 6.3V/0.3A (series) or 3.15V/0.6A (parallel). For 12.6V operation apply heater voltage between pins 4 and 5. For 6.3V operation apply heater voltage between pin 4 and pins 5+9 connected together.","Maximum ratings (Class A1): Va_max=300V, Pa_max=2.75W per plate (5.5W both), Ik_max=20mA, Vhk_max=200V, Rg_max=2.2MΩ.","Typical Class A1 operation (each triode unit): Va=250V, Vg=-8.5V, Ia=10.5mA, ra=7700Ω, gm=2200 µmhos, mu=17."],"references":["https://frank.pocnet.net/sheets/127/6/6AU7.pdf","https://www.radiomuseum.org/tubes/tube_6au7.html"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6AU7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6au7.html"},"raw_equivalents":["12AU7","12AU7A","ECC82","B329","CV4003","5814A"],"equivalents":[{"type_number":"12AU7","equivalence_type":"direct","notes":null},{"type_number":"ECC82","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6CG7","reason":"Same mu=20 medium-mu triode but different internal design and separate cathodes — verify pinout","has_detail_page":true},{"type_number":"7AU7","reason":"Same electricals but designed for 600mA series-heater string with controlled warm-up — Noval base, pin-compatible","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode (section 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"Grid (section 1)","function_code":"g1_1","notes":null},{"pin_number":"3","function":"Cathode (section 1)","function_code":"k1","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Heater / Heater CT","function_code":"h","notes":null},{"pin_number":"6","function":"Anode (section 2)","function_code":"a2","notes":null},{"pin_number":"7","function":"Grid (section 2)","function_code":"g1_2","notes":null},{"pin_number":"8","function":"Cathode (section 2)","function_code":"k2","notes":null},{"pin_number":"9","function":"Heater CT","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":"0.3","numeric_value":"0.3","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode (each section)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"2.75","numeric_value":"2.75","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":"200","numeric_value":"200","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"2.2","numeric_value":"2.2","unit":"MΩ","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":"-8.5","numeric_value":"-8.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"10.5","numeric_value":"10.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"7700","numeric_value":"7700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.2","numeric_value":"2.2","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"17","numeric_value":"17","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"1.5","numeric_value":"1.5","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"1.6","numeric_value":"1.6","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"0.4","numeric_value":"0.4","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:16:37.475Z"}