{"type_number":"6922","canonical_url":"https://tubeofile.com/tubes/6922","manufacturer":null,"tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Medium-mu twin triode with frame-grid construction for low-noise, high-transconductance applications. Designed as a premium long-life version of the 6DJ8/ECC88 with tighter tolerances and 10,000-hour rated life. Widely used in audio preamplifiers, test equipment, and instrumentation.","is_directly_heated":false,"completeness":"high","notes":["The 6922/E88CC is the special-quality long-life version of the ECC88/6DJ8. Tighter parameter tolerances and guaranteed 10,000-hour life vs standard ECC88.","CCa is the Telefunken premium-grade designation for the same tube (E88CC/6922/CCa).","7308/E188CC is an even higher reliability grade with tighter specs — can substitute for 6922 but not vice versa.","ECC88/6DJ8 is the standard commercial version — electrically identical but with wider tolerances and shorter rated life. Can substitute for 6922 in non-critical applications.","Fixed grid bias is only permitted when Ia <= 5 mA. For normal operating currents, cathode bias (self-bias) is required.","Max Pa is 1.5 W per section, but may be increased to 1.8 W per section provided total dissipation of both sections does not exceed 2 W.","This is a low-voltage tube — typical operating points are Va = 90-150 V, much lower than conventional dual triodes like 12AX7 or 12AU7.","Pin 9 is an internal shield between the two triode sections."],"references":["https://frank.pocnet.net/sheets/049/6/6922.pdf","https://tube-data.com/sheets/128/e/E88CC.pdf"],"source_urls":{"r_type":"https://www.r-type.org/exhib/aaa0883.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6922","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6922.html"},"raw_equivalents":["E88CC","CCa","ECC88","6DJ8","6N23P","6N23P-EV","7308","E188CC","CV2492","CV5358","ECC804"],"equivalents":[{"type_number":"6DJ8","equivalence_type":"direct","notes":null},{"type_number":"CCa","equivalence_type":"direct","notes":null},{"type_number":"ECC88","equivalence_type":"direct","notes":null}],"similar":[],"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":"0.3","numeric_value":"0.3","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":"220","numeric_value":"220","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":"20","numeric_value":"20","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":"100","numeric_value":"100","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-1.2","numeric_value":"-1.2","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":"Rk","display_name":"Cathode Resistor (self-bias)","value":"680","numeric_value":"680","unit":"Ω","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":"3.1","numeric_value":"3.1","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"1.75","numeric_value":"1.75","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:14:25.956Z"}