{"type_number":"6AH4","canonical_url":"https://tubeofile.com/tubes/6AH4","manufacturer":"Tung-Sol","tube_type_key":"power_triode","tube_type_display_name":"Power Triode","base_name":"Octal","description":"Medium-mu power triode in an octal GT glass envelope. Designed as vertical deflection amplifier in television receivers. Also used in audio as driver or single-ended output stage. High perveance design with 7.5W plate dissipation. Indirectly heated with coated unipotential cathode.","is_directly_heated":false,"completeness":"high","notes":["Tung-Sol datasheet (1952, tentative data): Two operating points given — Va=250V/Vg=-23V/Ia=30mA and Va=250V/Vg=-33V/Ia=5mA. Typical characteristics at 30mA point: gm=4500 µmhos, mu=8, ra=1780Ω.","Maximum ratings per RMA Standard MS-210 for vertical deflection amplifier service (525-line, 30-frame TV system).","Maximum peak positive plate voltage of 2000V; voltage pulse must not exceed 15% of one scanning cycle.","Maximum grid circuit resistance 2.2 MΩ; adequate bias resistor required to protect tube when excitation is absent.","MIL-HDBK-213A lists as 6AH4GT, class: receiving triode.","Muiderkring handbook lists on page 138, type classification: triode.","Grid voltage for 0.5mA plate current (approx.) is -40V."],"references":["https://frank.pocnet.net/sheets/127/6/6AH4GT.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6AH4GT","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6ah4gt.html"},"raw_equivalents":["6AH4GT"],"equivalents":[],"similar":[],"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":"Plate","function_code":"a","notes":null},{"pin_number":"4","function":"Grid","function_code":"g1","notes":null},{"pin_number":"5","function":"Cathode","function_code":"k","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":"No Connection","function_code":"nc","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":"0.75","numeric_value":"0.75","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode","tube_type_key":"power_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"500","numeric_value":"500","unit":"V","param_group":"absolute_max"},{"key":"Va_peak_max","display_name":"Peak Anode Voltage (max)","value":"2000","numeric_value":"2000","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"7.5","numeric_value":"7.5","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"60","numeric_value":"60","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":"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":"-23","numeric_value":"-23","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"30","numeric_value":"30","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"1780","numeric_value":"1780","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"4.5","numeric_value":"4.5","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"8","numeric_value":"8","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"4.4","numeric_value":"4.4","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"7","numeric_value":"7","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"1.7","numeric_value":"1.7","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:15:32.935Z"}