{"type_number":"ECC82","canonical_url":"https://tubeofile.com/tubes/ECC82","manufacturer":"Philips","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Medium-mu A.F. double triode. Two identical triode sections with independent cathodes in Noval (B9A) miniature envelope. Intended for use as audio-frequency amplifier, phase inverter, driver, and cathode follower. European Philips/Mullard designation for the 12AU7 family.","is_directly_heated":false,"completeness":"high","notes":["Philips/Mullard designation for the 12AU7 family, introduced in 1954. Electrically identical to the American 12AU7 but specified per Philips conventions.","Philips Rg_max is 1 MΩ (cathode bias), more conservative than the American 12AU7 spec of 2.2 MΩ. Circuit designers should use the Philips limit for reliability.","Philips specifies Vhk_max = 180V vs the American 12AU7 rating of 200V. Use the more conservative Philips figure.","At Va=100V, Vg=0V operating point: Ia=11.8mA, gm=3.1mA/V, mu=19.5, ra=6250 Ohm — useful for low-voltage designs.","With Vf applied to pins 4+5 and pin 9 center tap grounded, the section on pins 6, 7, 8 has lower hum pickup.","Can be operated with 6.3V or 12.6V heater supply. Series operation at 12.6V requires a current-limiting device in the heater circuit during switch-on.","The B329 is the Philips Miniwatt commercial designation for the same tube."],"references":["https://frank.pocnet.net/sheets/030/e/ECC82.pdf","https://frank.pocnet.net/sheets/010/e/ECC82.pdf","https://tdsl.duncanamps.com/show.php?des=ECC82"],"source_urls":{"r_type":"https://www.radiomuseum.org/tubes/tube_ecc82.html","tdsl":"https://tdsl.duncanamps.com/show.php?des=ECC82","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ecc82.html"},"raw_equivalents":["12AU7","12AU7A","12AU7WA","B329","CV491","CV4003","CV10323","CV10666","CV8155","CV8221","M8136","5814","5814A","5963","6067","6189","6680","7489","7730","E2163","E82CC","B749","6AU7","ECC802S"],"equivalents":[{"type_number":"12AU7","equivalence_type":"direct","notes":null},{"type_number":"6AU7","equivalence_type":"direct","notes":null},{"type_number":"ECC802S","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6SN7","reason":"Medium-mu dual triode (mu=20) but Octal base; similar electrical characteristics, widely used in audio","has_detail_page":true},{"type_number":"ECC40","reason":"Earlier Rimlock dual triode (mu=30); higher mu and gain but different base — predecessor in Philips numbering","has_detail_page":true},{"type_number":"ECC81","reason":"Same Noval dual triode pinout but higher mu (mu=60); lower plate current, higher ra — European designation for 12AT7","has_detail_page":false},{"type_number":"ECC83","reason":"Same Noval dual triode pinout but high-mu (mu=100); much lower plate current, used as voltage amplifier — European designation for 12AX7","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Anode 2 (Triode section 2)","function_code":"a2","notes":null},{"pin_number":"2","function":"Control Grid 2 (Triode section 2)","function_code":"g1_2","notes":null},{"pin_number":"3","function":"Cathode 2 (Triode section 2)","function_code":"k2","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"Anode 1 (Triode section 1)","function_code":"a1","notes":null},{"pin_number":"7","function":"Control Grid 1 (Triode section 1)","function_code":"g1_1","notes":null},{"pin_number":"8","function":"Cathode 1 (Triode section 1)","function_code":"k1","notes":null},{"pin_number":"9","function":"Heater center tap","function_code":"h","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"12.6","numeric_value":"12.6","unit":"V","param_group":"heater"},{"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":"0.15","numeric_value":"0.15","unit":"A","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.3","numeric_value":"0.3","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Va_peak_max","display_name":"Peak Anode Voltage (max)","value":"550","numeric_value":"550","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"2.75","numeric_value":"2.75","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"20","numeric_value":"20","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"180","numeric_value":"180","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"1","numeric_value":"1","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":"-8.5","numeric_value":"-8.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"10.5","numeric_value":"10.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"7700","numeric_value":"7700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.2","numeric_value":"2.2","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"17","numeric_value":"17","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"1.5","numeric_value":"1.5","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"1.8","numeric_value":"1.8","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"0.37","numeric_value":"0.37","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T19:07:16.988Z"}