{"type_number":"6CB5A","canonical_url":"https://tubeofile.com/tubes/6CB5A","manufacturer":"RCA","tube_type_key":"beam_tetrode","tube_type_display_name":"Beam Tetrode","base_name":"Octal","description":"Beam power tube designed for use as a horizontal-deflection amplifier in color television receivers. High perveance design with octal base and top-cap plate connection.","is_directly_heated":false,"completeness":"high","notes":["Plate connection is via a top cap (JEDEC No. C1-1), not through the octal base pins.","Pins 4 and 5 are both connected to Grid No.1 (control grid).","Pins 3 and 6 are both connected to Cathode/Grid No.3 (suppressor internally tied to cathode).","Pin 1 and Pin 8 are both connected to Grid No.2 (screen grid).","Originally designed for TV horizontal deflection, not audio. No manufacturer audio operating point or output power data exists.","An adequate bias resistor or other means is required to protect the tube in the absence of excitation.","The 6CB5A is unilaterally interchangeable with the 6CB5 (improved version).","Triode-strapped data sourced from Bartola Valves (https://www.bartola.co.uk/valves/tag/6cb5a-triode-mode-curves/), not from the manufacturer datasheet."],"references":["https://frank.pocnet.net/sheets/049/6/6CB5A.pdf","https://www.bartola.co.uk/valves/tag/6cb5a-triode-mode-curves/"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6CB5A","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6cb5a.html"},"raw_equivalents":["6CB5","6CL5","6P20S"],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"Screen Grid (G2)","function_code":"g2","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Cathode, Suppressor Grid (G3)","function_code":"k","notes":null},{"pin_number":"4","function":"Control Grid (G1)","function_code":"g1","notes":null},{"pin_number":"5","function":"Control Grid (G1)","function_code":"g1","notes":null},{"pin_number":"6","function":"Cathode, Suppressor Grid (G3)","function_code":"k","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Screen Grid (G2)","function_code":"g2","notes":null},{"pin_number":"Cap","function":"Plate (Anode)","function_code":"a","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":"2.5","numeric_value":"2.5","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Beam Tetrode","tube_type_key":"beam_tetrode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"880","numeric_value":"880","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"220","numeric_value":"220","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"26","numeric_value":"26","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"4","numeric_value":"4","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"240","numeric_value":"240","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":"0.47","numeric_value":"0.47","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"175","numeric_value":"175","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"175","numeric_value":"175","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-30","numeric_value":"-30","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"90","numeric_value":"90","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"6","numeric_value":"6","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"5000","numeric_value":"5000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"8.8","numeric_value":"8.8","unit":"mA/V","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.4","numeric_value":"0.4","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"22","numeric_value":"22","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"10","numeric_value":"10","unit":"pF","param_group":"capacitances"},{"key":null,"display_name":"Mu-Factor (Grid No.2 to Grid No.1)","value":"3.8","numeric_value":"3.8","unit":"—","param_group":null}]},{"section_number":2,"section_label":"Triode Strapped","tube_type_key":"power_triode","specs":[{"key":"Va","display_name":"Anode Voltage (typical)","value":"253","numeric_value":"253","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-50","numeric_value":"-50","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"40","numeric_value":"40","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"700","numeric_value":"700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"6.4","numeric_value":"6.4","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"4.5","numeric_value":"4.5","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:19:42.393Z"}