{"type_number":"6P18P","canonical_url":"https://tubeofile.com/tubes/6P18P","manufacturer":"Reflector (Saratov)","tube_type_key":"power_pentode","tube_type_display_name":"Power Pentode","base_name":"Noval","description":"Soviet indirectly-heated output pentode for low-frequency power amplification and vertical (frame) deflection output. Russian designation 6П18П, manufactured by Reflector (Saratov). Full pin-for-pin equivalent of the European EL82 / 6DY5 family, but with a higher anode dissipation rating (12 W vs 9 W).","is_directly_heated":false,"completeness":"high","notes":["Pins 3 and 9 are both control-grid (g1) terminals — the dual connection suppresses HF parasitic oscillations, a common feature on TV vertical-output pentodes in this family.","Higher anode dissipation rating than EL82 (12 W vs 9 W) — the 6P18P is the more rugged Soviet version of the EL82, but pin layout and electrical characteristics are otherwise compatible.","Russian datasheets list μ = 13 as the screen-to-control-grid amplification factor (μg2/g1), not a triode μ. This is normal for output pentodes and cannot be substituted into mu ≈ gm × ra.","Pulse anode voltage rating: 2500 V positive / -500 V negative. Cathode-heater voltage limit: 100 V.","Often marketed as an EL84 substitute, but EL84 has a completely different Noval pin layout — see similar entry."],"references":["https://soviet-tubes.com/product/6p18p-tube-output-pentode/","http://rutubes.com/product/6p18p-el82-tube/","https://radiomuseum.org/tubes/tube_6p18p.html"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6P18P","radiomuseum":"https://radiomuseum.org/tubes/tube_6p18p.html"},"raw_equivalents":["EL82","6DY5","6PY5"],"equivalents":[{"type_number":"EL82","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"EL84","reason":"Different Noval pin assignments — EL84 has g1 on pin 2, k on pin 3, a on pin 7, g2 on pin 9; 6P18P (EL82-family) has g1 on pins 3 and 9, k on pin 4, a on pin 7, g2 on pin 8. Not a drop-in substitute despite both being 6.3 V Noval output pentodes.","has_detail_page":true},{"type_number":"PL82","reason":"Series-heater (45 V / 0.1 A) version of the same EL82-family pentode — same pin layout but incompatible with 6.3 V parallel heater circuits.","has_detail_page":true}],"pins":[{"pin_number":"1","function":"No Connection (internal screen)","function_code":"nc","notes":null},{"pin_number":"2","function":"Suppressor Grid (internally connected to cathode)","function_code":"g3","notes":null},{"pin_number":"3","function":"Control Grid","function_code":"g1","notes":null},{"pin_number":"4","function":"Cathode","function_code":"k","notes":null},{"pin_number":"5","function":"Heater","function_code":"h","notes":null},{"pin_number":"6","function":"Heater","function_code":"h","notes":null},{"pin_number":"7","function":"Anode","function_code":"a","notes":null},{"pin_number":"8","function":"Screen Grid","function_code":"g2","notes":null},{"pin_number":"9","function":"Control Grid (second terminal)","function_code":"g1","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":"0.76","numeric_value":"0.76","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":"250","numeric_value":"250","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":"2.5","numeric_value":"2.5","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":"Va","display_name":"Anode Voltage (typical)","value":"180","numeric_value":"180","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"180","numeric_value":"180","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"53","numeric_value":"53","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"10.5","numeric_value":"10.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"22000","numeric_value":"22000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"11","numeric_value":"11","unit":"mA/V","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"110","numeric_value":"110","unit":"Ω","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"2.2","numeric_value":"2.2","unit":"W","param_group":"output"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.2","numeric_value":"0.2","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"11.5","numeric_value":"11.5","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"6","numeric_value":"6","unit":"pF","param_group":"capacitances"},{"key":null,"display_name":"Amplification Factor (g2/g1)","value":"13","numeric_value":"13","unit":null,"param_group":null}]}],"synced_at":"2026-04-08T06:03:18.300Z"}