{"type_number":"6S2S","canonical_url":"https://tubeofile.com/tubes/6S2S","manufacturer":null,"tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Octal","description":"Soviet single triode (6С2С) with medium amplification factor and Octal base. Direct equivalent of the Western 6J5GT. Indirectly heated, glass envelope. Used as an oscillator, detector, and audio-frequency voltage amplifier in Soviet equipment.","is_directly_heated":false,"completeness":"high","notes":["Cyrillic designation: 6С2С. The Latin transliteration 6S2S uses 'S' for Cyrillic 'С'.","Russian_equivalents.json confirms: 6S2S ≈ 6J5GT. Foreign_substitutes.json also lists 6S2S with western analogue 6J5GT.","Electrically identical to the 6J5GT: mu=20, gm=2600 µmhos, ra=7700Ω at Va=250V, Vg=-8V.","Same Octal pinout as 6J5GT — pin-compatible drop-in replacement."],"references":["https://frank.pocnet.net/sheets/127/6/6J5.pdf","https://www.radiomuseum.org/tubes/tube_6s2s.html"],"source_urls":{"r_type":null,"tdsl":null,"radiomuseum":"https://www.radiomuseum.org/tubes/tube_6s2s.html"},"raw_equivalents":["6J5","6J5GT","6J5G","CV1067","VT-94","L63"],"equivalents":[{"type_number":"6J5","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"12J5GT","reason":"12.6V heater version of 6J5GT — same electricals but incompatible heater","has_detail_page":true},{"type_number":"6S5S","reason":"Soviet equivalent of 6C5GT — similar single triode but different mu/gm characteristics","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Shell / No Connection","function_code":"nc","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":"No Connection","function_code":"nc","notes":null},{"pin_number":"5","function":"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","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":"0.3","numeric_value":"0.3","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":"2.5","numeric_value":"2.5","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"20","numeric_value":"20","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"90","numeric_value":"90","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":"Vg","display_name":"Grid 1 Bias Voltage","value":"-8","numeric_value":"-8","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"9","numeric_value":"9","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"7700","numeric_value":"7700","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.6","numeric_value":"2.6","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"20","numeric_value":"20","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"3.4","numeric_value":"3.4","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"3.4","numeric_value":"3.4","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"3.6","numeric_value":"3.6","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:28:13.828Z"}