{"type_number":"EC88","canonical_url":"https://tubeofile.com/tubes/EC88","manufacturer":"Philips","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Frame-grid UHF triode designed for use as an oscillator or amplifier up to 1000 MHz. Noval (B9A) base. Developed by Philips/Mullard for VHF/UHF television tuners. High transconductance (13.5 mA/V) with low inter-electrode capacitances for excellent UHF performance.","is_directly_heated":false,"completeness":"medium","notes":["Frame-grid construction provides very high transconductance (13.5 mA/V) in a compact structure.","Designed for operation up to 1000 MHz — suitable for UHF TV tuners and VHF/UHF oscillators.","Brans Vademecum lists EC88 with 6EU8 and PC88 as equivalents.","Low heater power: 6.3 V / 165 mA (approximately 1 W)."],"references":["https://tdsl.duncanamps.com/show.php?des=EC88","https://www.radiomuseum.org/tubes/?tube=EC88"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=EC88","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ec88.html"},"raw_equivalents":["6DL4"],"equivalents":[],"similar":[{"type_number":"E88C","reason":"Similar UHF triode — related but different characteristics","has_detail_page":true},{"type_number":"PC88","reason":"Series-heater version (300 mA) — same Noval base and pinout but different heater voltage","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Anode","function_code":"a","notes":null},{"pin_number":"2","function":"Cathode / Screen","function_code":"k","notes":null},{"pin_number":"3","function":"Heater","function_code":"h","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"6","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"7","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"8","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"9","function":"Cathode","function_code":"k","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":"0.165","numeric_value":"0.165","unit":"A","param_group":"heater"},{"key":"Va_max","display_name":"Anode Voltage (max)","value":"160","numeric_value":"160","unit":"V","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"160","numeric_value":"160","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-1.25","numeric_value":"-1.25","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"12.5","numeric_value":"12.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"4800","numeric_value":"4800","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"13.5","numeric_value":"13.5","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"65","numeric_value":"65","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"1.2","numeric_value":"1.2","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"3.8","numeric_value":"3.8","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"0.055","numeric_value":"0.055","unit":"pF","param_group":"capacitances"}],"sections":[{"section_number":1,"section_label":"Triode","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"160","numeric_value":"160","unit":"V","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"160","numeric_value":"160","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-1.25","numeric_value":"-1.25","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"12.5","numeric_value":"12.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"4800","numeric_value":"4800","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"13.5","numeric_value":"13.5","unit":"mA/V","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:38:32.647Z"}