{"type_number":"7802","canonical_url":"https://tubeofile.com/tubes/7802","manufacturer":"Tung-Sol","tube_type_key":"power_triode","tube_type_display_name":"Power Triode","base_name":"Octal","description":"Medium-mu twin power triode designed for electronically regulated power supplies. The high perveance permits passage of large currents at low plate voltages, providing efficient series regulation. The medium-mu (μ=9) requires a smaller signal voltage to control compared with equivalent low-mu types such as the 6080 (μ=2).","is_directly_heated":false,"completeness":"high","notes":["When paralleling sections for higher current, separate cathode resistors must be used in each leg to equalize current division. If output current is not fixed, use the resistance indicated for the lowest current approaching maximum plate dissipation.","Cathode resistance is superior to anode resistance for bias: it provides increasing bias on sections taking greater plate current, and a cathode resistor need only be R/(n+1) of a plate resistor's value, dissipating only one third the power.","A grid resistor of 1,000 ohms is recommended per section to prevent parasitic oscillation while maintaining control. Grid circuit resistance limits: 500-500,000 ohms for cathode bias; 500-50,000 ohms for fixed bias or combined cathode/fixed bias.","A minimum bias of 5V should be maintained to provide a safety margin from the zero-bias line. If cathode resistors are used, this corresponds to at least 5V of cathode-to-grid voltage under all operating conditions.","Heater-cathode voltage is rated at ±300V max. When connecting many high-drain tube heaters to a single transformer, use bus bars feeding alternate ends (Figure 3 in datasheet) with stranded pair to individual sockets.","The 7802 is frequently encountered in OTL headphone amplifier discussions as an alternative to the 6080/6AS7G family, where its higher mu and gm provide different sonic characteristics. It is NOT a drop-in replacement for the 6080 despite sharing the same pinout — the significantly higher gain changes the operating point in any circuit designed for low-mu types."],"references":["https://frank.pocnet.net/sheets/077/7/7802.pdf","https://frank.pocnet.net/sheets/077/7/7802WA.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=7802","radiomuseum":"https://www.radiomuseum.org/tubes/tube_7802.html"},"raw_equivalents":["7802WA","7802WB","6080","6AS7","6AS7G","6N13P"],"equivalents":[{"type_number":"6080","equivalence_type":"direct","notes":null},{"type_number":"6AS7","equivalence_type":"direct","notes":null},{"type_number":"6AS7G","equivalence_type":"direct","notes":null},{"type_number":"6N13P","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6N13S","reason":"Russian equivalent listed alongside 6080 and 7802 by Kainel'son & Larionov (1981). Same Octal pinout but Soviet manufacturing tolerances — mu=2 like 6080, not a drop-in for 7802 circuits","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Grid (triode 2)","function_code":"g1_2","notes":null},{"pin_number":"2","function":"Plate (triode 2)","function_code":"a2","notes":null},{"pin_number":"3","function":"Cathode (triode 2)","function_code":"k2","notes":null},{"pin_number":"4","function":"Grid (triode 1)","function_code":"g1_1","notes":null},{"pin_number":"5","function":"Plate (triode 1)","function_code":"a1","notes":null},{"pin_number":"6","function":"Cathode (triode 1)","function_code":"k1","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","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":"2.5","numeric_value":"2.5","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":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"13","numeric_value":"13","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"160","numeric_value":"160","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"300","numeric_value":"300","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":"100","numeric_value":"100","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-4","numeric_value":"-4","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"115","numeric_value":"115","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"450","numeric_value":"450","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"20","numeric_value":"20","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"9","numeric_value":"9","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"9.5","numeric_value":"9.5","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"7.8","numeric_value":"7.8","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"1.3","numeric_value":"1.3","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T19:05:26.568Z"}