{"type_number":"6N5P","canonical_url":"https://tubeofile.com/tubes/6N5P","manufacturer":"NEVZ (Novosibirsk)","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Soviet double triode designed for high-frequency voltage amplification in fast automatic gain control (FAGC) circuits. Indirectly heated cathode, Noval base. Two identical triode sections with separate cathodes and an internal shield on pin 9.","is_directly_heated":false,"completeness":"high","notes":["Cyrillic designation: 6Н5П. Also transliterated as 6H5P. The 1539 is a higher-quality-class variant of the same tube.","Pin 9 is an internal shield between the two triode sections, same arrangement as 6N6P and 6N1P.","The Chinese 6N5P (different tube entirely) is a power dual triode equivalent to 6AS7/6080 with an octal base and 2.4A heater — do not confuse with this Soviet noval small-signal type.","Plate resistance (ra) is not stated directly in the datasheet but can be calculated: ra = μ/gm = 27/4.2 ≈ 6430 Ω.","Capacitance values differ slightly between the two triode sections: Cak = 1.5 pF (triode 1) vs 1.7 pF (triode 2).","Heater current (0.6A) is double that of most Western noval dual triodes (e.g. 12AU7 at 0.15A for 12.6V operation) — verify heater supply capacity before substituting in circuits designed for lower-current types."],"references":["https://frank.pocnet.net/sheets/113/6/6N5P.pdf","https://soviet-tubes.com/product/russian-6n5p-double-triode-tube-with-separate-indirectly-heated-cathodes-low-frequency-preamplifier-near-analogue-6au7-7au7-ecc804-b729-6ga8/"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6N5P","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6n5p.html"},"raw_equivalents":["1539"],"equivalents":[],"similar":[{"type_number":"6AU7","reason":"Same 9A noval pinout but different characteristics: mu=20 vs 27, gm=3.1 vs 4.2 mA/V, Pa_max=2.75W vs 2.2W","has_detail_page":true},{"type_number":"6CG7","reason":"Noval double triode but completely different pinout (pins 1,2=heater vs 4,5=heater on 6N5P) — not interchangeable without rewiring","has_detail_page":true},{"type_number":"7AU7","reason":"Same noval pinout but 7V/300mA series heater instead of 6.3V/600mA","has_detail_page":true},{"type_number":"ECC804","reason":"Same noval pinout with shield on pin 9, but different characteristics: mu=17, gm=2.2 mA/V, 0.3A heater","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Anode (triode 1)","function_code":"a1","notes":null},{"pin_number":"2","function":"Grid (triode 1)","function_code":"g1_1","notes":null},{"pin_number":"3","function":"Cathode (triode 1)","function_code":"k1","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":"Anode (triode 2)","function_code":"a2","notes":null},{"pin_number":"7","function":"Grid (triode 2)","function_code":"g1_2","notes":null},{"pin_number":"8","function":"Cathode (triode 2)","function_code":"k2","notes":null},{"pin_number":"9","function":"Internal Shield","function_code":"ia","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":"0.6","numeric_value":"0.6","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":"300","numeric_value":"300","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"2.2","numeric_value":"2.2","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"25","numeric_value":"25","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"1","numeric_value":"1","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"200","numeric_value":"200","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-5.9","numeric_value":"-5.9","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"9.75","numeric_value":"9.75","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"6430","numeric_value":"6430","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"4.2","numeric_value":"4.2","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"27","numeric_value":"27","unit":"—","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"600","numeric_value":"600","unit":"Ω","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"2.25","numeric_value":"2.25","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"3","numeric_value":"3","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"1.5","numeric_value":"1.5","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:27:10.756Z"}