{"type_number":"6P3P","canonical_url":"https://tubeofile.com/tubes/6P3P","manufacturer":"Shuguang","tube_type_key":"beam_tetrode","tube_type_display_name":"Beam Tetrode","base_name":"Octal","description":"Chinese beam power tetrode, the Shuguang designation for a tube electrically and physically equivalent to the 6L6G. Indirectly heated with oxide cathode, designed for low-frequency power amplification in single-ended and push-pull output stages.","is_directly_heated":false,"completeness":"high","notes":["The 6P3P is the Chinese (Shuguang) designation for a 6L6G-class beam tetrode. Written as 6П3П in Cyrillic transliteration. Ratings are close to the original 6L6/6L6G (Pa_max 20.5W vs 19W for original 6L6) rather than the higher-rated 6L6GC (30W).","The Shuguang datasheet specifies gm = 6 mA/V at Va=250V, Vg2=250V, Vg1=-14V, which is slightly higher than the 5.2 mA/V typically specified for Western 6L6 types at the same operating point. Output power is specified as a minimum guarantee (≥5.4W) rather than a typical value.","Pin 1 connects to cathode/beam plates internally. Pin 6 has no internal connection. This matches the glass-envelope 6L6G pinout (on the original metal-envelope 6L6, pin 1 connects to the metal shell instead).","Maximum heater voltage range is 5.7V to 6.9V per the Shuguang datasheet.","Triode-strapped data sourced from Tom Schlangen's 'Pentodes Strapped as Triodes' (2009) table for the 6L6/KT66, as the 6P3P is electrically equivalent."],"references":["https://tube-data.com/sheets/095/6/6P3P.pdf","https://www.r-type.org/exhib/aaa1815.htm"],"source_urls":{"r_type":"https://www.r-type.org/exhib/aaa1815.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6P3P","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6p3p.html"},"raw_equivalents":["6L6","6L6G","6L6GT","6L6GA","6L6GB","6L6GC","6L6WGB","5881","CV1286","VT115","CV1948"],"equivalents":[{"type_number":"5881","equivalence_type":"direct","notes":null},{"type_number":"6L6","equivalence_type":"direct","notes":null},{"type_number":"6L6GC","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6P3S","reason":"Soviet equivalent of 6L6 with same pinout and similar ratings (Pa_max 20.5W, Va_max 400V) — likely pin-compatible but manufactured to different Soviet GOST standards; verify before substituting","has_detail_page":false},{"type_number":"KT66","reason":"GEC equivalent with similar characteristics but different internal construction — verify bias compatibility before substituting","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Cathode / Beam Plates","function_code":"k","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Anode","function_code":"a","notes":null},{"pin_number":"4","function":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"5","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"6","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode / Beam Plates","function_code":"k","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":"0.9","numeric_value":"0.9","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Beam Tetrode","tube_type_key":"beam_tetrode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"400","numeric_value":"400","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"20.5","numeric_value":"20.5","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"2.75","numeric_value":"2.75","unit":"W","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"200","numeric_value":"200","unit":"V","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":"-14","numeric_value":"-14","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"72","numeric_value":"72","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"8","numeric_value":"8","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"33000","numeric_value":"33000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"6","numeric_value":"6","unit":"mA/V","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"5.4","numeric_value":"5.4","unit":"W","param_group":"output"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"1.5","numeric_value":"1.5","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"11","numeric_value":"11","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"9.5","numeric_value":"9.5","unit":"pF","param_group":"capacitances"}]},{"section_number":2,"section_label":"Triode Strapped","tube_type_key":"power_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":"15","numeric_value":"15","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"125","numeric_value":"125","unit":"mA","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"300","numeric_value":"300","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"42","numeric_value":"42","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"1700","numeric_value":"1700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"4.7","numeric_value":"4.7","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"8","numeric_value":"8","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:27:49.903Z"}