{"type_number":"ECC40","canonical_url":"https://tubeofile.com/tubes/ECC40","manufacturer":"Philips","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Rimlock","description":"Medium-mu double triode on Rimlock base. Philips design for LF amplifier, phase inverter and output stages. Two identical sections with separate cathodes.","is_directly_heated":false,"completeness":"high","notes":["Philips Rimlock-era design introduced in 1948, superseded by ECC82 on Noval base from 1951.","Two identical triode sections with completely separate cathodes; heaters connected in parallel internally.","Maximum heater-cathode voltage is 175V (heater negative) or 100V (heater positive), notably higher than typical E-series valves.","Can be used without special microphony precautions when input voltage is at least 5 mV for output of 50 mW.","Each section heater draws 0.3A; total heater current is 0.6A at 6.3V."],"references":["https://frank.pocnet.net/sheets/030/e/ECC40.pdf","https://frank.pocnet.net/sheets/046/e/ECC40.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=ECC40","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ecc40.html"},"raw_equivalents":["CV3884","AA61"],"equivalents":[],"similar":[{"type_number":"6SN7GT","reason":"Medium-mu dual triode (mu=20) on Octal base; listed as predecessor by Philips, similar application as LF amplifier/phase inverter","has_detail_page":false},{"type_number":"ECC82","reason":"Medium-mu dual triode (mu=17) on Noval base; Philips successor to ECC40, lower mu but similar circuit roles","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode 1 (Triode section 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"Anode 2 (Triode section 2)","function_code":"a2","notes":null},{"pin_number":"3","function":"Control Grid 1 (Triode section 1)","function_code":"g1_1","notes":null},{"pin_number":"4","function":"Cathode 1 (Triode section 1)","function_code":"k1","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"Control Grid 2 (Triode section 2)","function_code":"g1_2","notes":null},{"pin_number":"7","function":"Cathode 2 (Triode section 2)","function_code":"k2","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":"0.6","numeric_value":"0.6","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":"Pa_max","display_name":"Anode Dissipation (max)","value":"1.5","numeric_value":"1.5","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"10","numeric_value":"10","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"175","numeric_value":"175","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":"-5.6","numeric_value":"-5.6","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"6","numeric_value":"6","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"11000","numeric_value":"11000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.9","numeric_value":"2.9","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"32","numeric_value":"32","unit":"—","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"920","numeric_value":"920","unit":"Ω","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"2.7","numeric_value":"2.7","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"2.8","numeric_value":"2.8","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"1.1","numeric_value":"1.1","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:39:07.028Z"}