{"type_number":"6P43P","canonical_url":"https://tubeofile.com/tubes/6P43P","manufacturer":"Reflector","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Noval","description":"Soviet low-frequency output pentode designed for power amplification in general and household equipment. Miniature glass envelope, Noval base. Near equivalent of the Western EL86/6CW5. Also available in extended-life variant 6P43P-E (6П43П-Е) rated for 5000 hours minimum operating life.","is_directly_heated":false,"completeness":"medium","notes":["Cyrillic designation: 6П43П (6P43P), 6П43П-Е (6P43P-E).","The 6P43P shares the same pinout as EL84/6BQ5 but is NOT a direct EL84 substitute — it has lower maximum screen voltage (250V vs 300V) and different operating characteristics. It is closer to the EL86/6CW5.","The suppressor grid (g3) is internally connected to the cathode at pin 3.","Internal resistance (ra) in pentode mode is not stated in the Soviet datasheet. The EL86 ra ≈ 26 kΩ (from Philips) may be used as a reference, though the 6P43P is not an exact EL86 equivalent.","Output power (Pout) and load impedance (rl) are not specified in the Soviet datasheet. The tube was designed primarily for TV vertical deflection output, not audio; audio output power is typically 3–5 W single-ended at 185V, based on community experience with this tube.","Triode-strapped data sourced from Tom Schlangen, 'Overview of pentodes / BPTs strapped as triodes' (September 2009), for the EL86 entry. The 6P43P is expected to behave similarly in triode mode.","Rg_max of 2.2 MΩ applies to self-bias (cathode resistor) operation."],"references":["https://soviet-tubes.com/product/6p43p-e-tube-pentode/","https://wtfamps.com/wp-content/uploads/2018/03/soviet-tubes-reference1.pdf","http://www.audiodesignguide.com/New2A3/ETF06TS.pdf"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_6p43p-e.html"},"raw_equivalents":["EL86","6CW5","CV5094"],"equivalents":[],"similar":[{"type_number":"6P33P","reason":"Soviet equivalent of EL86/6CW5 — closer match than 6P43P to the EL86 specification, same Noval pinout","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Internal Connection","function_code":"ia","notes":null},{"pin_number":"2","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"3","function":"Cathode (g3 internally connected)","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":"Internal Connection","function_code":"ia","notes":null},{"pin_number":"7","function":"Anode","function_code":"a","notes":null},{"pin_number":"8","function":"Internal Connection","function_code":"ia","notes":null},{"pin_number":"9","function":"Screen Grid","function_code":"g2","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":"0.625","numeric_value":"0.625","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Pentode","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":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"12","numeric_value":"12","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"2","numeric_value":"2","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"75","numeric_value":"75","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"100","numeric_value":"100","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"2.2","numeric_value":"2.2","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"185","numeric_value":"185","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"185","numeric_value":"185","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-16.2","numeric_value":"-16.2","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"45","numeric_value":"45","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"2.7","numeric_value":"2.7","unit":"mA","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"7.5","numeric_value":"7.5","unit":"mA/V","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"340","numeric_value":"340","unit":"Ω","param_group":"typical_operating"}]},{"section_number":2,"section_label":"Triode Strapped","tube_type_key":"power_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":"12","numeric_value":"12","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"100","numeric_value":"100","unit":"mA","param_group":"absolute_max"},{"key":"ra","display_name":"Anode Resistance","value":"1000","numeric_value":"1000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"7.5","numeric_value":"7.5","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"7.5","numeric_value":"7.5","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:27:57.230Z"}