{"type_number":"6F3P","canonical_url":"https://tubeofile.com/tubes/6F3P","manufacturer":"Reflector","tube_type_key":"triode_pentode","tube_type_display_name":"Triode-Pentode","base_name":"Noval","description":"Soviet triode-beam power pentode compound tube (6Ф3П) for audio output stages. Noval (B9A) base. The triode section serves as a voltage amplifier/driver and the beam power pentode section as the output stage, forming a complete audio amplifier in a single envelope. Functionally similar to the Western ECL82/6BM8.","is_directly_heated":false,"completeness":"high","notes":["6F3P is the Latin transliteration of the Cyrillic designation 6Ф3П.","Contains a triode section and a beam power pentode section in a single Noval envelope.","Radiomuseum lists 6BM8 and ECL82 as 'normally replaceable, slightly different' — not guaranteed pin-compatible drop-in.","Used in 13 documented radio/TV models from 1958-1968.","Quality suffix variants (e.g., 6F3P-E) exist but are not separate tube types — only the base designation is catalogued."],"references":["https://tdsl.duncanamps.com/show.php?des=6F3P","https://www.radiomuseum.org/tubes/?tube=6F3P"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6F3P","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6f3p.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"6BM8","reason":"Functionally similar Western triode-pentode — normally replaceable but slightly different characteristics","has_detail_page":false},{"type_number":"ECL82","reason":"European equivalent of the 6BM8 — similar function but slightly different specs","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Pentode Anode","function_code":"a2","notes":null},{"pin_number":"2","function":"Pentode Screen Grid","function_code":"g2","notes":null},{"pin_number":"3","function":"Pentode Cathode","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":"Triode Anode","function_code":"a1","notes":null},{"pin_number":"7","function":"Pentode Control Grid","function_code":"g1","notes":null},{"pin_number":"8","function":"Triode Grid","function_code":"g1t","notes":null},{"pin_number":"9","function":"Triode Cathode","function_code":"k1","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":"0.81","numeric_value":"0.81","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode (Driver)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"1.2","numeric_value":"1.2","unit":"W","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-2","numeric_value":"-2","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"6","numeric_value":"6","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"30000","numeric_value":"30000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.3","numeric_value":"2.3","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"70","numeric_value":"70","unit":"—","param_group":"typical_operating"}]},{"section_number":2,"section_label":"Beam Power Pentode (Output)","tube_type_key":"power_pentode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"9","numeric_value":"9","unit":"W","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-7.5","numeric_value":"-7.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"44","numeric_value":"44","unit":"mA","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"10.5","numeric_value":"10.5","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"4.5","numeric_value":"4.5","unit":"W","param_group":"output"}]}],"synced_at":"2026-04-07T12:22:51.983Z"}