{"type_number":"6BG6","canonical_url":"https://tubeofile.com/tubes/6BG6","manufacturer":"Tung-Sol","tube_type_key":"beam_tetrode","tube_type_display_name":"Beam Tetrode","base_name":"Octal","description":"Beam power amplifier with top-cap plate connection. Mechanical redesign of the 6L6G with additional plate insulation to withstand high peak plate voltages in horizontal deflection (TV line output) service. Also used in audio amplifiers. Octal base (5BT) with top-cap anode.","is_directly_heated":false,"completeness":"high","notes":["The 6BG6G has the same internal structure as the 6L6G but with the plate brought out to a top cap instead of a base pin. This provides the high-voltage insulation needed for TV horizontal deflection service where peak plate voltages can reach 6600V.","Maximum peak positive plate voltage is 6600V and peak negative plate voltage is 1500V — these extreme ratings are for TV flyback pulse operation, not continuous DC service.","Triode mu = 8.0 (measured at Eb=Ec2=250V, Ec1=-15V). This confirms the tube's 6L6 heritage — the 6L6 family has mu ≈ 8 in triode mode.","In stages operating with grid-leak bias, an adequate cathode bias resistor or other suitable means is required to protect the tube in the absence of excitation.","The 19BG6G is identical except for 19V/0.3A series heater (vs 6.3V/0.9A) — used in AC/DC TV receivers with series heater strings."],"references":["https://frank.pocnet.net/sheets/127/6/6BG6G.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6BG6","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6bg6g.html"},"raw_equivalents":["6BG6G","6BG6GA"],"equivalents":[],"similar":[{"type_number":"19BG6G","reason":"Identical except for heater ratings (19V series heater vs 6.3V) — not a drop-in in parallel heater circuits","has_detail_page":true},{"type_number":"6CD6","reason":"Similar TV horizontal deflection tube, Octal with top-cap plate, but higher power ratings (20W vs 20W) and different operating characteristics","has_detail_page":false},{"type_number":"6DQ6","reason":"Later TV horizontal deflection tube, Octal with top-cap plate — improved version for similar service","has_detail_page":true},{"type_number":"6L6","reason":"Electrically similar (same gm=6000, same ra=25kΩ) but 6L6 has internal plate on Octal base — 6BG6 has top-cap plate for higher voltage insulation","has_detail_page":true},{"type_number":"807","reason":"Same basic structure (beam tetrode with top-cap plate) but 807 uses UX5 base, not Octal — different socket entirely","has_detail_page":true}],"pins":[{"pin_number":"1","function":"No Connection (shell)","function_code":"nc","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Control Grid (g1)","function_code":"g1","notes":null},{"pin_number":"4","function":"Screen Grid (g2)","function_code":"g2","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"6","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode","function_code":"k","notes":null},{"pin_number":"top","function":"Anode (top cap)","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":"0.9","numeric_value":"0.9","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":"700","numeric_value":"700","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"350","numeric_value":"350","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"20","numeric_value":"20","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"3.2","numeric_value":"3.2","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"110","numeric_value":"110","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":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-15","numeric_value":"-15","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"75","numeric_value":"75","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"4","numeric_value":"4","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"25000","numeric_value":"25000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"6","numeric_value":"6","unit":"mA/V","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.34","numeric_value":"0.34","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"12","numeric_value":"12","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"6.5","numeric_value":"6.5","unit":"pF","param_group":"capacitances"}]},{"section_number":2,"section_label":"Triode Strapped","tube_type_key":"power_triode","specs":[{"key":"mu","display_name":"Amplification Factor (μ)","value":"8","numeric_value":"8","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:17:56.049Z"}