{"type_number":"6SC7","canonical_url":"https://tubeofile.com/tubes/6SC7","manufacturer":null,"tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Octal","description":"High-mu twin triode for AF voltage amplifier applications. Features special interlead shielding between grid and heater to reduce hum, making it well suited for low-level audio amplifier and phase-inverter service. Both sections share a common cathode.","is_directly_heated":false,"completeness":"medium","notes":["Both triode sections share a common cathode (pin 6). This makes the 6SC7 particularly suited for phase-inverter service but limits flexibility compared to twin triodes with separate cathodes (e.g. 6SL7GT).","Pin 1 (shell) is internally connected to pin 6 (cathode) on the metal-envelope 6SC7. The 6SC7GT glass variant uses the same basing.","The Rg_max value of 0.5 MΩ applies when both sections are used as a phase inverter. For phase-inverter service, the cathode resistor should not be bypassed by a capacitor — omission of the bypass condenser assists in balancing output voltages.","Originally introduced by RCA in November 1938 as a single-ended metal type specifically designed for phase-inverter service."],"references":["https://frank.pocnet.net/sheets/093/6/6SC7.pdf","https://frank.pocnet.net/sheets/201/6/6SC7.pdf","https://frank.pocnet.net/sheets/127/6/6SC7.pdf"],"source_urls":{"r_type":"http://www.r-type.org/exhib/abh0253.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6SC7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6sc7.html"},"raw_equivalents":["6SC7GT","6SC7GTY","VT-105","CV1969","CV2716","6N10S"],"equivalents":[{"type_number":"6N10S","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"12SC7","reason":"Same tube with 12.6V heater — requires different heater supply wiring","has_detail_page":true},{"type_number":"6SL7GT","reason":"Similar high-mu twin triode successor but Noval/Octal pinout differs and sections have separate cathodes","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Shell (internally connected to Cathode)","function_code":"ia","notes":null},{"pin_number":"2","function":"Plate 2 (Triode section 2)","function_code":"a2","notes":null},{"pin_number":"3","function":"Grid 2 (Triode section 2)","function_code":"g1_2","notes":null},{"pin_number":"4","function":"Grid 1 (Triode section 1)","function_code":"g1_1","notes":null},{"pin_number":"5","function":"Plate 1 (Triode section 1)","function_code":"a1","notes":null},{"pin_number":"6","function":"Cathode","function_code":"k","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","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":"0.3","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":"250","numeric_value":"250","unit":"V","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":"Rg_max","display_name":"Max Grid Resistor","value":"0.5","numeric_value":"0.5","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":"-2","numeric_value":"-2","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"2.0","numeric_value":"2","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"53000","numeric_value":"53000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"1.325","numeric_value":"1.325","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"70","numeric_value":"70","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"2.0","numeric_value":"2","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"2.0","numeric_value":"2","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"3.0","numeric_value":"3","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T19:04:57.379Z"}