{"type_number":"ECC88","canonical_url":"https://tubeofile.com/tubes/ECC88","manufacturer":null,"tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"High-slope, low-noise double triode with frame-grid construction, designed for use as a cascode amplifier in television tuners. Originally a VHF/UHF tube, now widely used in high-end audio preamplifiers due to its high transconductance and low noise. Standard commercial grade — the 6922/E88CC is the long-life premium version with tighter tolerances.","is_directly_heated":false,"completeness":"high","notes":["The ECC88/6DJ8 is the standard commercial version. The 6922/E88CC is the special-quality long-life version with tighter tolerances and 10,000-hour rated life.","7308/E188CC is an even higher reliability grade — can substitute for ECC88 but not vice versa in critical applications.","CCa is the Telefunken premium-grade designation for the E88CC/6922.","Not for storage battery supply — indirect heating only (AC or DC, parallel supply).","Max anode voltage is only 130V (DC component) — much lower than conventional dual triodes like ECC81 (300V) or ECC82 (300V). This is a low-voltage tube.","In cascode operation, the anode voltage across the grounded-cathode section should not exceed 75V in the uncontrolled condition.","Fixed grid bias is only permitted when Ia <= 5 mA. For normal operating currents, cathode bias (self-bias) is required.","Max Pa is 1.8 W per section, but Ik max is 25 mA per section.","Pin 9 is an internal shield between the two triode sections."],"references":["https://frank.pocnet.net/sheets/030/e/ECC88.pdf","https://frank.pocnet.net/sheets/010/e/ECC88.pdf"],"source_urls":{"r_type":"https://www.r-type.org/exhib/aaa0228.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=ECC88","radiomuseum":"https://www.radiomuseum.org/tubes/tube_ecc88.html"},"raw_equivalents":["6DJ8","6922","E88CC","CCa","CV2492","CV5358","6N23P","6N23P-EV","7308","E188CC","ECC804"],"equivalents":[{"type_number":"6922","equivalence_type":"direct","notes":null},{"type_number":"6DJ8","equivalence_type":"direct","notes":null},{"type_number":"CCa","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"ECC81","reason":"Noval double triode with same pinout but higher mu (60), lower gm (5.5 mA/V), higher ra (10.9 kΩ) — designed for higher Va operation","has_detail_page":false},{"type_number":"ECC85","reason":"Noval double triode for VHF/FM tuners but different characteristics (mu=58, gm=6.2 mA/V) and different pinout — not pin-compatible","has_detail_page":true},{"type_number":"PCC88","reason":"Series-string version with 7V/0.3A heater — identical characteristics otherwise but not a drop-in replacement due to different heater voltage","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Anode (triode 2)","function_code":"a2","notes":null},{"pin_number":"2","function":"Grid (triode 2)","function_code":"g1_2","notes":null},{"pin_number":"3","function":"Cathode (triode 2)","function_code":"k2","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 (triode 1)","function_code":"a1","notes":null},{"pin_number":"7","function":"Grid (triode 1)","function_code":"g1_1","notes":null},{"pin_number":"8","function":"Cathode (triode 1)","function_code":"k1","notes":null},{"pin_number":"9","function":"Internal Shield","function_code":"ia","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":"0.365","numeric_value":"0.365","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":"130","numeric_value":"130","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"1.8","numeric_value":"1.8","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"25","numeric_value":"25","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"150","numeric_value":"150","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":"90","numeric_value":"90","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-1.3","numeric_value":"-1.3","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"15","numeric_value":"15","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"2640","numeric_value":"2640","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"12.5","numeric_value":"12.5","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"33","numeric_value":"33","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"1.4","numeric_value":"1.4","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"3.3","numeric_value":"3.3","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"1.8","numeric_value":"1.8","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:39:41.239Z"}