{"type_number":"12W6GT","canonical_url":"https://tubeofile.com/tubes/12W6GT","manufacturer":null,"tube_type_key":"beam_tetrode","tube_type_display_name":"Beam Tetrode","base_name":"Octal","description":"Beam pentode power amplifier designed for use as a vertical scanning output tube in television receivers. 12.6V heater version of the 6W6GT, designed for series-string heater circuits. Electrically identical to the 6W6GT and 25L6GT.","is_directly_heated":false,"completeness":"high","notes":["12.6V heater version of the 6W6GT. Heater current is 0.6A at 12.6V (vs 1.2A at 6.3V for the 6W6GT). Same heater power consumption, different voltage/current ratio for series-string operation.","Brans Vademecum groups the 12W6GT with a large family including 6W6GT, 25L6GT, 6DG6GT, 12C5, 6CA5, and many other beam power types with similar characteristics.","Electrically identical to the 6W6GT — same section specs, same operating conditions, same output power.","Pin 8 connects cathode and suppressor grid (beam-forming plates) internally."],"references":["https://frank.pocnet.net/sheets/127/6/6W6GT.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=12W6GT","radiomuseum":"https://www.radiomuseum.org/tubes/tube_12w6gt.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"25L6GT","reason":"Electrically identical but 25V/0.3A heater — not a drop-in substitute","has_detail_page":true},{"type_number":"6W6","reason":"Electrically identical but 6.3V/1.2A heater — not a drop-in in 12.6V series heater circuits","has_detail_page":true}],"pins":[{"pin_number":"1","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Anode (Plate)","function_code":"a","notes":null},{"pin_number":"4","function":"Screen Grid (g2)","function_code":"g2","notes":null},{"pin_number":"5","function":"Control Grid (g1)","function_code":"g1","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 and Beam Plates (g3)","function_code":"k","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"12.6","numeric_value":"12.6","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.6","numeric_value":"0.6","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":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"165","numeric_value":"165","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"12","numeric_value":"12","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"1.35","numeric_value":"1.35","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"65","numeric_value":"65","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":"0.5","numeric_value":"0.5","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"200","numeric_value":"200","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"125","numeric_value":"125","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"0","numeric_value":"0","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"46","numeric_value":"46","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"2.2","numeric_value":"2.2","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"28000","numeric_value":"28000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"8.0","numeric_value":"8","unit":"mA/V","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"180","numeric_value":"180","unit":"Ω","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"3.8","numeric_value":"3.8","unit":"W","param_group":"output"},{"key":"rl","display_name":"Load Impedance","value":"4000","numeric_value":"4000","unit":"Ω","param_group":"output"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.8","numeric_value":"0.8","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"15","numeric_value":"15","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"9","numeric_value":"9","unit":"pF","param_group":"capacitances"}]},{"section_number":2,"section_label":"Triode Strapped","tube_type_key":"power_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":"8.5","numeric_value":"8.5","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"65","numeric_value":"65","unit":"mA","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":"225","numeric_value":"225","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":"22","numeric_value":"22","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"1600","numeric_value":"1600","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"3.8","numeric_value":"3.8","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"6.2","numeric_value":"6.2","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:05:54.482Z"}