{"type_number":"6BA6","canonical_url":"https://tubeofile.com/tubes/6BA6","manufacturer":"RCA","tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"B7G","description":"Remote-cutoff (variable-mu) RF pentode for use as AGC-controlled RF and IF amplifier in radio and television receivers. 7-pin miniature replacement for the octal 6SK7.","is_directly_heated":false,"completeness":"high","notes":["Remote-cutoff (variable-mu) characteristic: transconductance varies smoothly with grid bias, enabling AGC control without cross-modulation distortion.","Grid No.3 (suppressor) is connected to cathode at the socket — external connection required.","RCA specifies two operating conditions: Va=100V/Vg2=100V (Ia=10.8mA, gm=4.3mA/V) and Va=250V/Vg2=100V (Ia=11mA, gm=4.4mA/V).","Cathode bias resistor Rk=68 Ω for the standard operating point.","Brimar rates Vg2_max at 125 V for the operating condition, while RCA allows Vg2_supply up to 330 V — consult specific manufacturer data for your application.","Vhk_max is 200 V (both polarities, but DC component must not exceed 100 V when heater is positive)."],"references":["https://frank.pocnet.net/sheets/049/6/6BA6.pdf"],"source_urls":{"r_type":null,"tdsl":"http://tdsl.duncanamps.com/show.php?des=6BA6","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6ba6.html"},"raw_equivalents":["EF93","CV454","W727","5749","6BD6"],"equivalents":[{"type_number":"5749","equivalence_type":"direct","notes":null},{"type_number":"6BD6","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6AU6","reason":"Sharp-cutoff version with same pinout — not suitable where variable-mu (AGC) operation is required","has_detail_page":false},{"type_number":"6BA6W","reason":"Ruggedised military version — electrically identical, different mechanical construction","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Control Grid (g1)","function_code":"g1","notes":null},{"pin_number":"2","function":"Suppressor Grid (g3) + Internal Shield","function_code":"g3","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":"Anode","function_code":"a","notes":null},{"pin_number":"6","function":"Screen Grid (g2)","function_code":"g2","notes":null},{"pin_number":"7","function":"Cathode","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":"Pentode","tube_type_key":"ss_pentode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"3.4","numeric_value":"3.4","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"0.7","numeric_value":"0.7","unit":"W","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":"Va","display_name":"Anode Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"100","numeric_value":"100","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-1","numeric_value":"-1","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"11","numeric_value":"11","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"4.2","numeric_value":"4.2","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":"4.4","numeric_value":"4.4","unit":"mA/V","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.0035","numeric_value":"0.0035","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"5.5","numeric_value":"5.5","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"5.5","numeric_value":"5.5","unit":"pF","param_group":"capacitances"},{"key":null,"display_name":"Cathode Bias Resistor","value":"68","numeric_value":"68","unit":"Ω","param_group":null}]}],"synced_at":"2026-04-07T19:02:33.491Z"}