{"type_number":"6DR7","canonical_url":"https://tubeofile.com/tubes/6DR7","manufacturer":"RCA","tube_type_key":"compound","tube_type_display_name":"Compound (multi-section)","base_name":"Noval","description":"Dissimilar double triode with high-mu and medium-mu sections in 9-pin miniature construction. Section #1 (high-mu) intended for use as vertical deflection oscillator. Section #2 (medium-mu/low-mu) designed for use as vertical deflection amplifier in television receivers.","is_directly_heated":false,"completeness":"high","notes":["Section #2 is identical to section #2 of the 6DE7 (Tung-Sol datasheet).","10DR7 is identical to the 6DR7 except for heater ratings and heater warm-up time (Tung-Sol datasheet).","Pin 2 and Pin 3 are both connected to the control grid of Unit No.2 (dual grid pins).","Heater positive with respect to cathode must not exceed 100V DC component.","Originally designed for vertical deflection circuits in television sets, but adopted by DIY audio designers as a driver/output tube in low-power amplifiers due to its combined high-mu voltage amplifier and medium-mu power section."],"references":["https://frank.pocnet.net/sheets/049/6/6DR7.pdf","https://frank.pocnet.net/sheets/127/6/6DR7.pdf"],"source_urls":{"r_type":"https://www.r-type.org/exhib/abg0010.htm","tdsl":"https://tdsl.duncanamps.com/show.php?des=6DR7","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6dr7.html"},"raw_equivalents":["10DR7","13DR7","19DR7","6DA7"],"equivalents":[{"type_number":"6DA7","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6DE7","reason":"Section #2 of the 6DR7 is identical to section #2 of the 6DE7 per Tung-Sol datasheet, but section #1 differs. Not a drop-in replacement.","has_detail_page":true},{"type_number":"6EM7","reason":"Brans cross-lists in the same group — same pinout family but Octal base (8BD) vs Noval (9HF), different pin topology","has_detail_page":true},{"type_number":"6EW7","reason":"Brans cross-lists — same Noval 9HF pinout but Section 1 has much lower mu (17.5 vs 68)","has_detail_page":true},{"type_number":"6FD7","reason":"Same 9HF pinout and dissimilar double triode structure, but different electrical characteristics (Unit 2: gm=7.5 vs 6.5 mA/V, Pa_max=10W vs 7W, Ih=0.925A vs 0.9A). Sams Tube Substitution Handbook lists as substitute.","has_detail_page":true},{"type_number":"6FR7","reason":"Same 9HF pinout and dissimilar double triode structure, but different electrical characteristics. Sams Tube Substitution Handbook lists as substitute for 6DR7.","has_detail_page":true},{"type_number":"6GF7","reason":"Brans cross-lists — similar dissimilar twin triode but different characteristics; verify before substituting","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Plate (Unit No.2)","function_code":"a2","notes":null},{"pin_number":"2","function":"Grid (Unit No.2)","function_code":"g1_2","notes":null},{"pin_number":"3","function":"Grid (Unit No.2)","function_code":"g1_2","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":"Plate (Unit No.1)","function_code":"a1","notes":null},{"pin_number":"7","function":"Grid (Unit No.1)","function_code":"g1_1","notes":null},{"pin_number":"8","function":"Cathode (Unit No.1)","function_code":"k1","notes":null},{"pin_number":"9","function":"Cathode (Unit No.2)","function_code":"k2","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":"High-Mu 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":"1","numeric_value":"1","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":"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":"-3","numeric_value":"-3","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"1.4","numeric_value":"1.4","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"40000","numeric_value":"40000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"1.6","numeric_value":"1.6","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"68","numeric_value":"68","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"4.5","numeric_value":"4.5","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":"0.34","numeric_value":"0.34","unit":"pF","param_group":"capacitances"}]},{"section_number":2,"section_label":"Medium-Mu Triode","tube_type_key":"power_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"275","numeric_value":"275","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"7","numeric_value":"7","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":"150","numeric_value":"150","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-17.5","numeric_value":"-17.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"35","numeric_value":"35","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"925","numeric_value":"925","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"6.5","numeric_value":"6.5","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"6","numeric_value":"6","unit":"—","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"8.5","numeric_value":"8.5","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"5.5","numeric_value":"5.5","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"1","numeric_value":"1","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T19:03:16.868Z"}