{"type_number":"6AT6","canonical_url":"https://tubeofile.com/tubes/6AT6","manufacturer":"RCA","tube_type_key":"compound","tube_type_display_name":"Compound (multi-section)","base_name":"B7G","description":"Duplex-diode high-mu triode in a miniature B7G envelope. The two diode plates are used for AM detection and AVC, while the triode section serves as a first audio amplifier. Indirectly heated.","is_directly_heated":false,"completeness":"high","notes":["The triode section has mu=70, Rp=58kΩ, Gm=1200 umhos at Va=250V, Vg=-3V.","Widely used in AM broadcast receivers as a combined detector, AVC, and first audio amplifier.","The European designation is EBC90 (Mullard) or DH77 (Brimar). CV452 is the British military equivalent."],"references":["https://frank.pocnet.net/sheets/049/6/6AT6.pdf","https://tdsl.duncanamps.com/show.php?des=6AT6"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6AT6","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6at6.html"},"raw_equivalents":["6AT6A","DH77","EBC90","CV452","6066"],"equivalents":[],"similar":[{"type_number":"6AQ6","reason":"Similar duplex-diode triode on B7G base — close substitute","has_detail_page":true},{"type_number":"6AV6","reason":"Same duplex-diode triode structure and B7G base but lower mu (100 vs 70) — different bias points","has_detail_page":true},{"type_number":"6BK6","reason":"Similar duplex-diode triode on B7G base — substitute in some circuits","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Diode Plate 1","function_code":"d1","notes":null},{"pin_number":"2","function":"Grid (triode)","function_code":"g1","notes":null},{"pin_number":"3","function":"Heater","function_code":"h","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Plate (triode)","function_code":"a","notes":null},{"pin_number":"6","function":"Diode Plate 2","function_code":"d2","notes":null},{"pin_number":"7","function":"Cathode (common)","function_code":"k","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","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":"0.5","numeric_value":"0.5","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":"-3","numeric_value":"-3","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"1.0","numeric_value":"1","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"58000","numeric_value":"58000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"1.2","numeric_value":"1.2","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"70","numeric_value":"70","unit":"—","param_group":"typical_operating"}]},{"section_number":2,"section_label":"Diode (each)","tube_type_key":"diode","specs":[]}],"synced_at":"2026-04-07T12:16:28.731Z"}