{"type_number":"E88C","canonical_url":"https://tubeofile.com/tubes/E88C","manufacturer":"Philips","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Special quality (S.Q.) single triode designed for use as grounded-grid aerial amplifier for UHF band IV and V. Noval (B9A) base with gold-plated pins. High mutual conductance of 13.5 mA/V and low noise figure (9.6 dB at 850 MHz). Philips design, rated for 10,000-hour life test.","is_directly_heated":false,"completeness":"high","notes":["Single triode — not to be confused with the E88CC which is a double triode.","Gold-plated Noval base pins for low interface resistance.","Designed for grounded-grid amplifier operation at UHF frequencies (band IV/V, up to 850 MHz).","10,000-hour rated life under specified test conditions.","Heater voltage must be maintained at 6.3 V average; exceeding 6.0-6.6 V range shortens tube life.","Amplification factor mu = 70, internal resistance Ri = 5.2 kohm."],"references":["https://frank.pocnet.net/sheets/009/e/E88C.pdf"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_e88c.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"E88CC","reason":"Double triode variant (two sections) — different tube, not a substitute","has_detail_page":false},{"type_number":"EC86","reason":"Similar UHF triode — different characteristics","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Grid","function_code":"g","notes":null},{"pin_number":"2","function":"Cathode","function_code":"k","notes":null},{"pin_number":"3","function":"Grid","function_code":"g","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":"Internal shield","function_code":"ia","notes":null},{"pin_number":"7","function":"Grid","function_code":"g","notes":null},{"pin_number":"8","function":"Anode","function_code":"a","notes":null},{"pin_number":"9","function":"Anode","function_code":"a","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":"0.155","numeric_value":"0.155","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":"2.6","numeric_value":"2.6","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"16.5","numeric_value":"16.5","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"125","numeric_value":"125","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":"5200","numeric_value":"5200","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":"70","numeric_value":"70","unit":"—","param_group":"typical_operating"},{"key":null,"display_name":"Equivalent Noise Resistance","value":"240","numeric_value":"240","unit":"Ω","param_group":null},{"key":null,"display_name":"Noise Figure (850 MHz)","value":"9.6","numeric_value":"9.6","unit":"dB","param_group":null},{"key":null,"display_name":"Anode Voltage (max, cold start)","value":"400","numeric_value":"400","unit":"V","param_group":null}]}],"synced_at":"2026-04-07T12:37:58.500Z"}