{"type_number":"6DS8","canonical_url":"https://tubeofile.com/tubes/6DS8","manufacturer":"Philips","tube_type_key":"triode_hexode","tube_type_display_name":"Triode-Hexode","base_name":"Noval","description":"Triode-heptode frequency converter in a Noval (B9A) envelope. Designed for use as mixer/oscillator in FM and AM receivers and as sync separator in television sets. The ECH83 is the European equivalent. Indirectly heated.","is_directly_heated":false,"completeness":"high","notes":["Valve Equivalents reference lists as Triode Pentode on B9A base — however radiomuseum and Brans classify correctly as triode-heptode.","Philips interchange confirms 6DS8=ECH83.","Brans Vademecum (Table VIb) lists with 6AJ8, 1B7G, 1C3/DK96, 1L6, and other frequency converters.","Muiderkring Handbook page 163 lists this type."],"references":["https://tdsl.duncanamps.com/show.php?des=6DS8","https://www.radiomuseum.org/tubes/?tube=6DS8"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6DS8","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6ds8.html"},"raw_equivalents":["ECH83"],"equivalents":[{"type_number":"ECH83","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6AJ8","reason":"Brans lists in same group (Table VIb) — similar triode-heptode converter","has_detail_page":false},{"type_number":"ECH81","reason":"Same Noval base and pinout — reportedly identical internally to ECH83, only stamped differently","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Heptode Anode","function_code":"a2","notes":null},{"pin_number":"2","function":"Heptode Screen Grid (g2+g4)","function_code":"g2","notes":null},{"pin_number":"3","function":"Common Cathode, Suppressor Grid (g5)","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":"Triode Anode","function_code":"a1","notes":null},{"pin_number":"7","function":"Heptode Signal Grid (g1)","function_code":"g1","notes":null},{"pin_number":"8","function":"Triode Grid / Heptode Oscillator Grid (g3)","function_code":"g3","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":"0.3","numeric_value":"0.3","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Triode (Oscillator)","tube_type_key":"small_signal_triode","specs":[{"key":"Va","display_name":"Anode Voltage (typical)","value":"12.6","numeric_value":"12.6","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"0.75","numeric_value":"0.75","unit":"mA","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"1.4","numeric_value":"1.4","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"18.3","numeric_value":"18.3","unit":"—","param_group":"typical_operating"}]},{"section_number":2,"section_label":"Heptode (Mixer)","tube_type_key":"hexode","specs":[{"key":"Va","display_name":"Anode Voltage (typical)","value":"12.6","numeric_value":"12.6","unit":"V","param_group":"typical_operating"},{"key":"Vs","display_name":"Screen Voltage (typical)","value":"12.6","numeric_value":"12.6","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"0.55","numeric_value":"0.55","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"500000","numeric_value":"500000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"0.22","numeric_value":"0.22","unit":"mA/V","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:22:08.652Z"}