{"type_number":"EC8010","canonical_url":"https://tubeofile.com/tubes/EC8010","manufacturer":"Telefunken","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Special quality UHF frame-grid triode designed for RF amplifiers and oscillators in grounded-grid configuration up to 1000 MHz. Indirectly heated, Noval base. Features low interface resistance cathode, tight electrical tolerances, and shock/vibration resistance for professional and military applications. Guaranteed 10,000 hour life. Predecessor to the EC8020.","is_directly_heated":false,"completeness":"high","notes":["Designated 'S.Q. Tube' (Special Quality) by Telefunken — tighter tolerances than standard receiving types.","Frame-grid construction provides exceptionally high transconductance (28 mA/V) for a small-signal triode.","Five grid pins (1, 3, 6, 7, 9) — all must be connected to suppress parasitic UHF oscillation.","Interface-free special cathode: no interface layer builds up even when heated without plate current for extended periods.","No-signal anode supply voltage (Uao) may reach 400 V; operating anode voltage limited to 200 V max.","Grid dissipation limited to 40 mW — grid current must be kept very low.","First published May 1963 (Funkschau #9); Telefunken datasheet dated December 1968 / January 1965.","Radiomuseum lists 8556 as a normally replaceable near-equivalent.","Popular in high-end audio as a low-impedance voltage amplifier and driver stage despite original UHF designation."],"references":["https://frank.yueksel.org/sheets/009/e/EC8010.pdf","https://frank.yueksel.org/sheets/117/e/EC8010.pdf"],"source_urls":{"r_type":"http://www.r-type.org/exhib/aby0109.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=EC8010","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ec8010.html"},"raw_equivalents":["8556"],"equivalents":[],"similar":[{"type_number":"6S45P","reason":"Soviet frame-grid single triode with very high gm (~45 mA/V) and low ra; similar high-gm low-ra triode concept, higher dissipation (7.8 W vs 4.2 W)","has_detail_page":true},{"type_number":"C3g","reason":"Siemens/Telefunken frame-grid pentode for Bundespost wideband amplifiers; similar professional-grade construction and tight tolerances, but pentode not triode","has_detail_page":true},{"type_number":"D3a","reason":"Siemens frame-grid pentode for professional wideband service; similar high-gm design philosophy, different structure","has_detail_page":true},{"type_number":"EC8020","reason":"Successor Telefunken frame-grid UHF triode with higher gm; same Noval base and design philosophy","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Grid","function_code":"g1","notes":null},{"pin_number":"2","function":"Cathode","function_code":"k","notes":null},{"pin_number":"3","function":"Grid","function_code":"g1","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":"Grid","function_code":"g1","notes":null},{"pin_number":"7","function":"Grid","function_code":"g1","notes":null},{"pin_number":"8","function":"Anode","function_code":"a","notes":null},{"pin_number":"9","function":"Grid","function_code":"g1","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":"0.28","numeric_value":"0.28","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":"200","numeric_value":"200","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"4.2","numeric_value":"4.2","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"35","numeric_value":"35","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":"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":"200","numeric_value":"200","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-1","numeric_value":"-1","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":"2400","numeric_value":"2400","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"28","numeric_value":"28","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"60","numeric_value":"60","unit":"—","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"47","numeric_value":"47","unit":"Ω","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":"6.5","numeric_value":"6.5","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"0.1","numeric_value":"0.1","unit":"pF","param_group":"capacitances"},{"key":"freq","display_name":"Max Operating Frequency","value":"1000","numeric_value":"1000","unit":"MHz","param_group":"noise_rf"},{"key":null,"display_name":"Grid Dissipation (max)","value":"40","numeric_value":"40","unit":"mW","param_group":null},{"key":null,"display_name":"Cathode Current, pulse (max)","value":"100","numeric_value":"100","unit":"mA","param_group":null},{"key":null,"display_name":"Negative Grid Voltage (max)","value":"-20","numeric_value":"-20","unit":"V","param_group":null},{"key":null,"display_name":"Heater-Cathode Resistance (max)","value":"20000","numeric_value":"20000","unit":"Ω","param_group":null},{"key":null,"display_name":"Max Envelope Temperature","value":"150","numeric_value":"150","unit":"°C","param_group":null},{"key":null,"display_name":"Equivalent Noise Resistance (raeq)","value":"140","numeric_value":"140","unit":"Ω","param_group":null},{"key":null,"display_name":"No-signal Anode Supply Voltage (max)","value":"400","numeric_value":"400","unit":"V","param_group":null}]}],"synced_at":"2026-04-07T12:38:10.560Z"}