{"type_number":"6BH11","canonical_url":"https://tubeofile.com/tubes/6BH11","manufacturer":"RCA","tube_type_key":"compound","tube_type_display_name":"Compound (multi-section)","base_name":"Duodekal","description":"Medium-mu twin triode–sharp-cutoff pentode compound tube in a 12-pin Duodecar envelope. Designed for color and black-and-white television receiver applications. The triode units are used for general-purpose amplification, and the pentode unit is used for horizontal-deflection oscillator service. Indirectly heated.","is_directly_heated":false,"completeness":"high","notes":["The pentode section is rated for two distinct services: as a horizontal-deflection oscillator (Va_max=350V, Vg2_max=330V, Ik_peak=300mA, Pa_max=2.5W) and as a Class A1 amplifier (Va_max=300V, Vg2_max=300V, Pa_max=3W).","Pentode Grid No.2 max input: 0.6W for Vg2 up to 150V; higher voltages require consulting the screen input rating curve.","Pin 11 serves as both Pentode Cathode and Pentode Grid No.3 (suppressor connected to cathode internally), with internal shield.","Heater-to-cathode voltage: ±200V peak, 100V average maximum.","The twin triode sections are identical medium-mu units (μ=46, ra≈5.4kΩ). Both sections have identical characteristics."],"references":["https://frank.yueksel.org/sheets/191/6/6BH11.pdf","https://tdsl.duncanamps.com/show.php?des=6BH11"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6BH11","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6bh11.html"},"raw_equivalents":[],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"Heater","function_code":"h","notes":null},{"pin_number":"2","function":"Cathode of Triode Unit No.2","function_code":"k2","notes":null},{"pin_number":"3","function":"Plate of Triode Unit No.2","function_code":"a2","notes":null},{"pin_number":"4","function":"Grid of Triode Unit No.1","function_code":"g1_1","notes":null},{"pin_number":"5","function":"Cathode of Triode Unit No.1","function_code":"k1","notes":null},{"pin_number":"6","function":"Internal Shield (Pentode)","function_code":"ic","notes":null},{"pin_number":"7","function":"Plate of Triode Unit No.1","function_code":"a1","notes":null},{"pin_number":"8","function":"Grid No.1 of Pentode (Control)","function_code":"g1","notes":null},{"pin_number":"9","function":"Grid No.2 of Pentode (Screen)","function_code":"g2","notes":null},{"pin_number":"10","function":"Plate of Pentode","function_code":"a","notes":null},{"pin_number":"11","function":"Cathode of Pentode, Grid No.3, Internal Shield","function_code":"k","notes":null},{"pin_number":"12","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":"0.8","numeric_value":"0.8","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode (each unit)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"2.5","numeric_value":"2.5","unit":"W","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"2.2","numeric_value":"2.2","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"125","numeric_value":"125","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":"13.5","numeric_value":"13.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"5400","numeric_value":"5400","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"8.5","numeric_value":"8.5","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"46","numeric_value":"46","unit":"—","param_group":"typical_operating"}]},{"section_number":2,"section_label":"Pentode","tube_type_key":"sharp_cutoff_pentode","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":"3","numeric_value":"3","unit":"W","param_group":"absolute_max"},{"key":"Vg2_max","display_name":"Screen Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"2.2","numeric_value":"2.2","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":"-1","numeric_value":"-1","unit":"V","param_group":"typical_operating"},{"key":"Vg2","display_name":"Screen Voltage","value":"100","numeric_value":"100","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"9.2","numeric_value":"9.2","unit":"mA","param_group":"typical_operating"},{"key":"mAg2","display_name":"Screen Current","value":"3.3","numeric_value":"3.3","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"1300000","numeric_value":"1300000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"3.6","numeric_value":"3.6","unit":"mA/V","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:18:03.431Z"}