{"type_number":"6DN7","canonical_url":"https://tubeofile.com/tubes/6DN7","manufacturer":"Tung-Sol","tube_type_key":"compound","tube_type_display_name":"Compound (multi-section)","base_name":"Octal","description":"Dissimilar double triode with medium-mu sections of different characteristics in Octal construction. Section #1 is designed for use as a vertical-deflection oscillator in television receivers and Section #2 for use as a vertical deflection amplifier.","is_directly_heated":false,"completeness":"high","notes":["Dissimilar dual triode: Section #1 (medium-mu oscillator, pins 4/5/6) has mu=22.5; Section #2 (medium-mu amplifier, pins 1/2/3) has mu=15.4. Both sections are medium-mu but with substantially different plate resistance and transconductance.","Section #2 Pa_max of 10W is for short interval only (two seconds maximum) so as not to damage the tube.","Heater positive with respect to cathode DC component must not exceed 100V.","Brans vademecum groups the 6DN7 with the 6FJ7, 12A4, and ECC34."],"references":["https://frank.pocnet.net/sheets/127/6/6DN7.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6DN7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6dn7.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"6DE7","reason":"Brans cross-lists in same dissimilar triode group. Noval (9HF) vs Octal (8BD) base. Different mu values (17.5/6.0 vs 22.5/15.4).","has_detail_page":true},{"type_number":"6EM7","reason":"Same Octal 8BD basing but very different mu/ra characteristics (6DN7: mu 22.5/15.4 vs 6EM7: mu 68/5.4). Not a like-for-like substitute.","has_detail_page":true},{"type_number":"6EW7","reason":"Brans cross-lists. Noval base. Different mu values and base topology.","has_detail_page":true},{"type_number":"6FJ7","reason":"Brans lists as equivalent (same table IIIf group with 12A4 and ECC34). Verify pin compatibility before substituting.","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Grid (Unit No.2 - Amplifier)","function_code":"g1_2","notes":null},{"pin_number":"2","function":"Plate (Unit No.2 - Amplifier)","function_code":"a2","notes":null},{"pin_number":"3","function":"Cathode (Unit No.2 - Amplifier)","function_code":"k2","notes":null},{"pin_number":"4","function":"Grid (Unit No.1 - Oscillator)","function_code":"g1_1","notes":null},{"pin_number":"5","function":"Plate (Unit No.1 - Oscillator)","function_code":"a1","notes":null},{"pin_number":"6","function":"Cathode (Unit No.1 - Oscillator)","function_code":"k1","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Heater","function_code":"h","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":"0.9","numeric_value":"0.9","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Medium-Mu Triode (Oscillator)","tube_type_key":"small_signal_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"350","numeric_value":"350","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":"50","numeric_value":"50","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"200","numeric_value":"200","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"2.2","numeric_value":"2.2","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":"-8.0","numeric_value":"-8","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"8.0","numeric_value":"8","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"9000","numeric_value":"9000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"2.5","numeric_value":"2.5","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"22.5","numeric_value":"22.5","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":"Cin","display_name":"Input Capacitance","value":"2.2","numeric_value":"2.2","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"0.7","numeric_value":"0.7","unit":"pF","param_group":"capacitances"}]},{"section_number":2,"section_label":"Medium-Mu Triode (Amplifier)","tube_type_key":"power_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"550","numeric_value":"550","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"10","numeric_value":"10","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"50","numeric_value":"50","unit":"mA","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"200","numeric_value":"200","unit":"V","param_group":"absolute_max"},{"key":"Rg_max","display_name":"Max Grid Resistor","value":"2.2","numeric_value":"2.2","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":"-9.5","numeric_value":"-9.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"41","numeric_value":"41","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"2000","numeric_value":"2000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"7.7","numeric_value":"7.7","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"15.4","numeric_value":"15.4","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"5.5","numeric_value":"5.5","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"4.6","numeric_value":"4.6","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"1.0","numeric_value":"1","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T12:21:30.627Z"}