{"type_number":"6J9P","canonical_url":"https://tubeofile.com/tubes/6J9P","manufacturer":null,"tube_type_key":"ss_pentode","tube_type_display_name":"Small Signal Pentode","base_name":"Noval","description":"Soviet sharp-cutoff pentode (6Ж9П) with very high transconductance, designed for wide-band video amplifier and IF amplifier service. Noval base, indirectly heated. Equivalent to the Western E180F/6688. Frame-grid construction provides exceptional transconductance (~25 mA/V).","is_directly_heated":false,"completeness":"high","notes":["Cyrillic designation: 6Ж9П. Russian_equivalents.json confirms: 6J9P ≈ E180F, 6688.","Frame-grid construction gives very high transconductance (~25 mA/V at typical operating point), making it one of the highest-gm small-signal pentodes available.","The E180F/6688 is a Philips/Amperex design widely used in professional audio and instrumentation. The Soviet 6J9P is the direct copy.","Used extensively in Soviet oscilloscope vertical amplifiers and wide-band IF stages.","Can be triode-strapped for audio applications — provides very high transconductance as a triode."],"references":["https://www.radiomuseum.org/tubes/tube_6j9p.html"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_6j9p.html"},"raw_equivalents":["E180F","6688","6676"],"equivalents":[{"type_number":"E180F","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6AH6","reason":"Western sharp-cutoff pentode with high gm — similar application but lower transconductance (~9000 vs ~25000 µmhos)","has_detail_page":true},{"type_number":"6J11P","reason":"Soviet E280F equivalent — even higher gm than 6J9P","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Grid 3 (Suppressor)","function_code":"g3","notes":null},{"pin_number":"2","function":"Anode","function_code":"a","notes":null},{"pin_number":"3","function":"Cathode","function_code":"k","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":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"7","function":"Grid 1 (Control)","function_code":"g1","notes":null},{"pin_number":"8","function":"Cathode","function_code":"k","notes":null},{"pin_number":"9","function":"Internal Shield","function_code":"is","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":"0.4","numeric_value":"0.4","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Pentode","tube_type_key":"ss_pentode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"150","numeric_value":"150","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"3.5","numeric_value":"3.5","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"1","numeric_value":"1","unit":"W","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"200","numeric_value":"200","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"120","numeric_value":"120","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-1.5","numeric_value":"-1.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"25","numeric_value":"25","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"7","numeric_value":"7","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"40000","numeric_value":"40000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"25","numeric_value":"25","unit":"mA/V","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.005","numeric_value":"0.005","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"12","numeric_value":"12","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"4.5","numeric_value":"4.5","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-08T07:52:55.156Z"}