{"type_number":"7027A","canonical_url":"https://tubeofile.com/tubes/7027A","manufacturer":"RCA","tube_type_key":"beam_tetrode","tube_type_display_name":"Beam Tetrode","base_name":"Octal","description":"Beam power tube for high-fidelity audio amplifier applications. Supersedes the 7027. Features higher plate and screen voltage ratings than the 6L6GC. Introduced by RCA in 1959.","is_directly_heated":false,"completeness":"high","notes":["The 7027A supersedes the original 7027 with improved ratings.","Push-pull Class AB1 with fixed bias at Va=450V, Vg2=350V delivers 76W from two tubes into 6500 Ω plate-to-plate.","Push-pull Class AB1 with cathode bias at Va=425V, Vg2=425V, Rk=200 Ω delivers 44W from two tubes into 3800 Ω plate-to-plate.","Maximum ratings (push-pull): Va=600V, Vs=600V (screen grid tied to tap on output transformer primary), Pa=35W, Ps=5W.","Rg_max: 0.1 MΩ (fixed bias), 0.5 MΩ (cathode bias). Peak heater-cathode voltage: 200V (either polarity).","Base is Small-Wafer Octal 8-Pin with '950' Sleeve (JEDEC Group 1, B8-191). Basing designation 8MY (bottom view).","The 7027A has no exact pin-for-pin equivalent. KT88 is listed as a Sams substitute but has different characteristics."],"references":["https://frank.pocnet.net/sheets/049/7/7027A.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=7027A","radiomuseum":"https://www.radiomuseum.org/tubes/tube_7027a.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"6L6GC","reason":"Same 6L6 family with same pinout but lower plate and screen voltage ratings (450V vs 600V)","has_detail_page":true},{"type_number":"KT66","reason":"Sams lists KT66 as substitute for 7027 — GEC beam tetrode with similar application","has_detail_page":true},{"type_number":"KT88","reason":"Sams lists KT88 as substitute — GEC beam tetrode with higher ratings, same Octal pinout","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Screen Grid (Grid No. 2)","function_code":"g2","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Plate","function_code":"a","notes":null},{"pin_number":"4","function":"Screen Grid (Grid No. 2)","function_code":"g2","notes":null},{"pin_number":"5","function":"Control Grid (Grid No. 1)","function_code":"g1","notes":null},{"pin_number":"6","function":"Control Grid (Grid No. 1)","function_code":"g1","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode + Grid No. 3","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":"0.9","numeric_value":"0.9","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Beam Tetrode","tube_type_key":"beam_tetrode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"600","numeric_value":"600","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"600","numeric_value":"600","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"35","numeric_value":"35","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"5","numeric_value":"5","unit":"W","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":"0.1","numeric_value":"0.1","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":"Vs","display_name":"Screen Voltage (typical)","value":"250","numeric_value":"250","unit":"V","param_group":"typical_operating"},{"key":"Vg","display_name":"Grid 1 Bias Voltage","value":"-14","numeric_value":"-14","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"72","numeric_value":"72","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"5","numeric_value":"5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"22500","numeric_value":"22500","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"6.0","numeric_value":"6","unit":"mA/V","param_group":"typical_operating"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"1.5","numeric_value":"1.5","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"10","numeric_value":"10","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"7.5","numeric_value":"7.5","unit":"pF","param_group":"capacitances"}]}],"synced_at":"2026-04-07T19:05:15.744Z"}