{"type_number":"6N2P","canonical_url":"https://tubeofile.com/tubes/6N2P","manufacturer":null,"tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Soviet high-mu twin triode (6Н2П). Two identical triode sections used as a low-noise voltage amplifier / preamplifier. Electrically close to the ECC83/12AX7 but NOT pin-compatible.","is_directly_heated":false,"completeness":"high","notes":["Cyrillic designation: 6Н2П. Russian military/industrial variants: 6N2P-EV (6Н2П-ЕВ, long-life ≥5000 h, vibration-resistant) and 6N2P-ER (6Н2П-ЕР, extended-life ≥10000 h).","NOT a drop-in replacement for ECC83/12AX7 despite similar electricals. The two heater elements are internally connected in parallel on pins 4 and 5, so only 6.3 V operation is possible (no 12.6 V series option). Pin 9 is an internal electrostatic screen between the two triodes, NOT a heater center tap as on 12AX7 — it is typically grounded.","Retrofitting a 12AX7 circuit for 6N2P requires rewiring the heater wiring and grounding pin 9.","Datasheet gain coefficient is specified as 97.5 ± 17.5 (6N2P) / 100 ± 15 (6N2P-EV). Internal plate resistance (ra) is not explicitly tabulated on the Russian datasheet; the value ≈43 kΩ is derived from the nominal mu/gm (97.5 / 2.25 mA·V⁻¹) and is consistent with published Russian handbook values.","Characterised at Va=250 V, Vg=−1.5 V, Vh=6.3 V. Operating period rated ≥5000 h for both standard and -EV grades."],"references":["https://www.tubeampdoctor.com/media/pdf/27/f8/77/6n2p_6n2p-ev_6h2n_6h2n-eb.pdf","https://frank.pocnet.net/sheets/113/6/6N2P.pdf","https://www.r-type.org/exhib/abn0001.htm","https://en.wikipedia.org/wiki/6N2P"],"source_urls":{"r_type":"https://www.r-type.org/exhib/abn0001.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6N2P","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6n2p.html"},"raw_equivalents":["6Н2П","6N2P-EV","6N2P-ER","6H2П","6H2П-ЕВ","6H2П-ЕР"],"equivalents":[],"similar":[{"type_number":"12AX7","reason":"Very close electrically (mu≈98 vs 100) but NOT pin-compatible: 6N2P heaters are internally parallel on pins 4/5 (no series-heater option, no pin 9 heater center tap), and 6N2P pin 9 is an electrostatic screen between the two triodes. Requires rewiring or an adapter.","has_detail_page":true},{"type_number":"5751","reason":"Ruggedized high-mu twin triode (mu=70) on standard 12AX7 Noval pinout; 6N2P has higher mu (≈98) but different pinout (shield on pin 9, parallel heaters only).","has_detail_page":true},{"type_number":"6N1P","reason":"Soviet twin triode on same Noval base, but medium-mu (mu≈35) voltage amplifier with much lower ra — different gain class.","has_detail_page":true},{"type_number":"ECC83","reason":"Same high-mu twin-triode electricals as ECC83 (mu≈98) but different Noval pinout — 6N2P has pin 9 as electrostatic screen and parallel-only heaters on pins 4/5.","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Anode 2 (Triode section 2)","function_code":"a2","notes":null},{"pin_number":"2","function":"Control Grid 2 (Triode section 2)","function_code":"g1_2","notes":null},{"pin_number":"3","function":"Cathode 2 (Triode section 2)","function_code":"k2","notes":null},{"pin_number":"4","function":"Heater (parallel with pin 5)","function_code":"h","notes":null},{"pin_number":"5","function":"Heater (parallel with pin 4)","function_code":"h","notes":null},{"pin_number":"6","function":"Anode 1 (Triode section 1)","function_code":"a1","notes":null},{"pin_number":"7","function":"Control Grid 1 (Triode section 1)","function_code":"g1_1","notes":null},{"pin_number":"8","function":"Cathode 1 (Triode section 1)","function_code":"k1","notes":null},{"pin_number":"9","function":"Electrostatic screen between triodes (typically grounded)","function_code":"ic","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":"0.34","numeric_value":"0.34","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":"1.0","numeric_value":"1","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"10","numeric_value":"10","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":"0.5","numeric_value":"0.5","unit":"MΩ","param_group":"absolute_max"},{"key":"Va","display_name":"Anode Voltage (typical)","value":"250","numeric_value":"250","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":"1.8","numeric_value":"1.8","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"43333","numeric_value":"43333","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.25","numeric_value":"2.25","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"97.5","numeric_value":"97.5","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.75","numeric_value":"0.75","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"2.25","numeric_value":"2.25","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"2.3","numeric_value":"2.3","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-21T23:12:22.049Z"}