{"type_number":"5687","canonical_url":"https://tubeofile.com/tubes/5687","manufacturer":"Tung-Sol","tube_type_key":"small_signal_triode","tube_type_display_name":"Small Signal Triode","base_name":"Noval","description":"Medium-mu twin triode, 9-pin miniature type. Centre-tapped heater for 12.6V series or 6.3V parallel operation. High perveance and high emission capability, originally designed for computer applications, CW/pulsed oscillator, and cathode follower service.","is_directly_heated":false,"completeness":"high","notes":["Heater can be wired in series (12.6V / 0.45A across pins 4-5) or parallel (6.3V / 0.9A with pins 4 and 5 tied together). For 6.3V operation apply heater voltage between pins 4&5 connected together and pin 8 (heater midpoint).","The 7119/E182CC is pin-compatible but has significantly different electrical characteristics: higher mu (~28 vs 16-18), higher gm, and lower heater current (0.64A vs 0.9A at 6.3V). Not all circuits designed for the 5687 will perform identically with a 7119 — verify operating point compatibility.","The 7044 is electrically very similar to the 5687 but rated for higher total plate dissipation (8W both sections vs 7.5W).","Originally developed by Tung-Sol (registered February 1948) for computer and industrial applications. Also manufactured by GE, RCA, Raytheon, and Sylvania. Widely adopted in high-end audio as a driver tube due to its high current capability and low plate resistance."],"references":["https://tube-data.com/sheets/049/5/5687.pdf","https://tube-data.com/sheets/127/5/5687.pdf"],"source_urls":{"r_type":"https://www.r-type.org/exhib/aaa0436.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=5687","radiomuseum":"https://www.radiomuseum.org/tubes/tube_5687.html"},"raw_equivalents":["CK5687","CV2578","5687WA","5687WB","7044","7119","E182CC","6900","TS229"],"equivalents":[],"similar":[],"pins":[{"pin_number":"1","function":"Anode (Unit 2)","function_code":"a2","notes":null},{"pin_number":"2","function":"Control Grid (Unit 2)","function_code":"g1_2","notes":null},{"pin_number":"3","function":"Cathode (Unit 2)","function_code":"k2","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 (Unit 1)","function_code":"k1","notes":null},{"pin_number":"7","function":"Control Grid (Unit 1)","function_code":"g1_1","notes":null},{"pin_number":"8","function":"Heater Midpoint","function_code":"h","notes":null},{"pin_number":"9","function":"Anode (Unit 1)","function_code":"a1","notes":null}],"specs":[{"key":"Vh","display_name":"Heater Voltage","value":"6.3 / 12.6","numeric_value":"6.3","unit":"V","param_group":"heater"},{"key":"Ah","display_name":"Heater Current","value":"0.9 / 0.45","numeric_value":"0.9","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":"330","numeric_value":"330","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"4.2","numeric_value":"4.2","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"6.6","numeric_value":"6.6","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":"1","numeric_value":"1","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":"-12.5","numeric_value":"-12.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"12","numeric_value":"12","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"3000","numeric_value":"3000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"5.4","numeric_value":"5.4","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"16","numeric_value":"16","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"4.0","numeric_value":"4","unit":"pF","param_group":"capacitances"},{"key":"Cgk","display_name":"Grid-to-Cathode Capacitance","value":"4.0","numeric_value":"4","unit":"pF","param_group":"capacitances"},{"key":"Cak","display_name":"Anode-to-Cathode Capacitance","value":"0.6","numeric_value":"0.6","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:11:01.978Z"}