{"type_number":"6S45P","canonical_url":"https://tubeofile.com/tubes/6S45P","manufacturer":null,"tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Soviet high-transconductance single triode (6С45П) with frame-grid construction, designed for wideband video amplifier and regulator service. Noval base, indirectly heated. Extremely high gm (~45 mA/V) and low plate resistance (~1.2 kΩ) make it popular in high-end audio as a voltage amplifier and single-ended driver stage.","is_directly_heated":false,"completeness":"high","notes":["Cyrillic designation: 6С45П. Western transliteration 6C45Pi (or 6C45P) is used by Sovtek and Electro-Harmonix.","Frame-grid construction provides very high transconductance and low transit-time effects for wideband use.","Four cathode pins (1, 3, 6, 9) and two grid pins (2, 8) — all must be connected to avoid parasitic oscillation.","Grid stopper resistors (100–500Ω) recommended at the socket to suppress UHF oscillation.","Heater potential should be elevated (~75–80 Vdc) to minimise hum and buzz in audio applications.","The -E and -EV suffixes denote enhanced reliability/military quality grades of the same tube.","Sovtek datasheet dated from EHX/New Sensor Corporation production."],"references":["https://shop.ehx.com/catalog/addimages/6c45pi-sovtek.pdf","https://pearl-hifi.com/06_Lit_Archive/08_Tube_Data/Cons_Data/6S45P-E_Cons_Data.pdf"],"source_urls":{"r_type":"http://www.r-type.org/exhib/abn0053.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6C45Pi","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6s45p.html"},"raw_equivalents":["6C45Pi","6S45P-E","6S45P-EV"],"equivalents":[],"similar":[{"type_number":"417A","reason":"Western Electric single noval triode with similar high-gm low-ra design philosophy (mu=43, gm=25 mA/V, ra=1700Ω); different pinout","has_detail_page":true},{"type_number":"EC8010","reason":"Philips/Mullard single triode with high gm and low ra (mu=60, Pa_max=4.2W); lower dissipation, different base","has_detail_page":true},{"type_number":"WE437A","reason":"Western Electric single triode (mu=41, Pa_max=7W); similar dissipation class but different base and pinout","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Cathode","function_code":"k","notes":null},{"pin_number":"2","function":"Grid","function_code":"g1","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":"Cathode","function_code":"k","notes":null},{"pin_number":"7","function":"Anode","function_code":"a","notes":null},{"pin_number":"8","function":"Grid","function_code":"g1","notes":null},{"pin_number":"9","function":"Cathode","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":"0.44","numeric_value":"0.44","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"150","numeric_value":"150","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"7.8","numeric_value":"7.8","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"52","numeric_value":"52","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":"0.15","numeric_value":"0.15","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"150","numeric_value":"150","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":"40","numeric_value":"40","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"1156","numeric_value":"1156","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"45","numeric_value":"45","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"52","numeric_value":"52","unit":"—","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"30","numeric_value":"30","unit":"Ω","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"1.1","numeric_value":"1.1","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":"1.9","numeric_value":"1.9","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:28:29.257Z"}