{"type_number":"ECC99","canonical_url":"https://tubeofile.com/tubes/ECC99","manufacturer":"JJ Electronic","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Medium-mu double triode with high plate dissipation (5W per section), designed as a driver for directly heated power triodes (300B, 2A3) and as a power tube for headphone amplifiers and small power amplifiers. Noval (B9A) base. Currently manufactured by JJ Electronic.","is_directly_heated":false,"completeness":"high","notes":["The ECC99 is a modern tube with no historical equivalent — it was designed by JJ Electronic specifically as a high-dissipation driver tube. There are no pin-for-pin drop-in equivalents from other manufacturers.","With 5W per section plate dissipation and 200V max plate voltage, it can deliver substantial current making it suitable as a driver for power triodes like 300B and 2A3.","Also used as an output tube in headphone amplifiers and small single-ended power amplifiers delivering up to approximately 1W.","Standard Noval (B9A) pinout identical to ECC82/ECC83/ECC88 family: pin 1=anode 1, pin 2=grid 1, pin 3=cathode 1, pin 6=anode 2, pin 7=grid 2, pin 8=cathode 2, pins 4+5=heater, pin 9=centre tap/shield.","Max heater-to-cathode voltage is 100V. Heater can be operated on AC or DC."],"references":["https://www.jj-electronic.com/en/ecc99","https://tdsl.duncanamps.com/show.php?des=ECC99"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=ECC99","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ecc99.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"5687","reason":"High-current double triode (mu=17.5, ra=2.4kΩ, Pa=3.75W) on Noval base — similar driver application but lower dissipation and different operating point","has_detail_page":true},{"type_number":"6BX7GT","reason":"High-current Octal twin triode (mu=10, Pa=6W) — similar driver application but Octal base, not Noval","has_detail_page":false},{"type_number":"6N6P","reason":"Soviet double triode on Noval base, similar high-current driver application — different electrical parameters","has_detail_page":true},{"type_number":"E182CC","reason":"Philips/Mullard high-dissipation double triode with Noval base (mu=21, ra=2.65kΩ, Pa=4.5W) — similar application as power driver but different electricals","has_detail_page":false},{"type_number":"ECC88","reason":"Noval double triode with same pinout but much lower dissipation (1.5W) and different characteristics (mu=33, ra=2.6kΩ)","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode (section 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"Grid (section 1)","function_code":"g1_1","notes":null},{"pin_number":"3","function":"Cathode (section 1)","function_code":"k1","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 (section 2)","function_code":"a2","notes":null},{"pin_number":"7","function":"Grid (section 2)","function_code":"g1_2","notes":null},{"pin_number":"8","function":"Cathode (section 2)","function_code":"k2","notes":null},{"pin_number":"9","function":"Heater Centre Tap / Internal Shield","function_code":"hct","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":"0.8","numeric_value":"0.8","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode (each section)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"200","numeric_value":"200","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"5","numeric_value":"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":"100","numeric_value":"100","unit":"V","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":"-6.5","numeric_value":"-6.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"25","numeric_value":"25","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"3700","numeric_value":"3700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"6.0","numeric_value":"6","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"22","numeric_value":"22","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"1.8","numeric_value":"1.8","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"3.3","numeric_value":"3.3","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"1.0","numeric_value":"1","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:39:47.053Z"}