{"type_number":"6SA7","canonical_url":"https://tubeofile.com/tubes/6SA7","manufacturer":"Tung-Sol","tube_type_key":"compound","tube_type_display_name":"Compound (multi-section)","base_name":"Octal","description":"Pentagrid converter (heptode) in metal shell or glass bulb with Octal base. Designed to minimize frequency drift when used as combined oscillator-mixer in superheterodyne receivers. Seven-electrode tube with separate oscillator and signal grids.","is_directly_heated":false,"completeness":"high","notes":["The 6SA7 has five grids: Grid 1 (oscillator), Grids 2 and 4 (screen, connected together), Grid 3 (signal input), and Grid 5 (suppressor, connected to cathode at socket).","Maximum ratings: Va=300V, Vg2/g4=300V (supply), Pa=1W, Pg2/g4=1W, Ik=14mA.","Conversion transconductance at Eg3=-2V: 450 umhos. Oscillator transconductance (grids 2 and 4 to plate): 4500 umhos.","Self-excited operation uses 20kΩ cathode resistor. Separate excitation also supported."],"references":["https://frank.pocnet.net/sheets/127/6/6SA7.pdf","https://tdsl.duncanamps.com/show.php?des=6SA7"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6SA7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6sa7.html"},"raw_equivalents":["6SA7GT","6SA7GTX","CV1966","VT150A","VT-150"],"equivalents":[],"similar":[{"type_number":"6A8","reason":"Older pentagrid converter on Octal base with different grid structure","has_detail_page":true},{"type_number":"6BE6","reason":"Miniature (B7G) pentagrid converter — electrically similar but different base, not pin-compatible","has_detail_page":true},{"type_number":"7Q7","reason":"Datasheet notes ratings and characteristics somewhat similar — Loctal base","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Shell (Metal type) / No Connection (GT)","function_code":"shell","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Anode","function_code":"a","notes":null},{"pin_number":"4","function":"Grids 2 & 4 (Screen)","function_code":"g2_g4","notes":null},{"pin_number":"5","function":"Grid 3 (Signal Input)","function_code":"g3","notes":null},{"pin_number":"6","function":"Grid 5 (Suppressor) — connect to cathode","function_code":"g5","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode, Grid 1 (Oscillator)","function_code":"k_g1","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":"Pentagrid Converter","tube_type_key":"compound","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Vg2_max","display_name":"Screen Voltage (max)","value":"100","numeric_value":"100","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":"Pg2_max","display_name":"Screen Dissipation (max)","value":"1","numeric_value":"1","unit":"W","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"90","numeric_value":"90","unit":"V","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":"-2","numeric_value":"-2","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"3.5","numeric_value":"3.5","unit":"mA","param_group":"typical_operating"},{"key":"Vg2","display_name":"Screen Voltage","value":"100","numeric_value":"100","unit":"V","param_group":"typical_operating"},{"key":"mAg2","display_name":"Screen Current","value":"8.5","numeric_value":"8.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"1000000","numeric_value":"1000000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"0.45","numeric_value":"0.45","unit":"mA/V","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:28:45.994Z"}