{"type_number":"6AQ5","canonical_url":"https://tubeofile.com/tubes/6AQ5","manufacturer":null,"tube_type_key":"beam_tetrode","tube_type_display_name":"Beam Tetrode","base_name":"B7G","description":"Miniature beam power tube designed for audio output service in radio and television receivers. Introduced in 1946, it became one of the most widely used miniature audio output tubes, appearing in nearly 6,000 documented radio and TV models. Electrically similar to the 6V6 but in a compact 7-pin miniature envelope.","is_directly_heated":false,"completeness":"high","notes":["The 6AQ5A is a controlled heater warm-up version; the 6AQ5W/6005 is the ruggedised military variant. All share the same pinout and are drop-in replacements within their respective voltage ratings.","Rg_max differs by bias type: 0.1 MΩ for fixed-bias operation, 0.5 MΩ for cathode-bias operation (RCA datasheet).","Tung-Sol datasheet specifies Va_max = 275 V and Vs_max = 275 V for Class A1 amplifier service. RCA datasheet specifies 250 V for both. The Tung-Sol values with arrow notation indicate a change from previous ratings. The more conservative RCA ratings are used here for max values.","Pin 1 and Pin 7 are both connected to Grid No.1 (control grid) — dual grid pins reduce lead inductance for improved high-frequency performance.","Triode-strapped data from the Tung-Sol manufacturer datasheet. Schlangen (2009) independently measured similar values: μ=10, gm=5.0 mA/V, rp=2.0 kΩ.","RCA notes that curves for the 6AQ5-A are the same as those shown for the 6V6, underscoring the close electrical similarity between the two types despite different package formats."],"references":["https://frank.pocnet.net/sheets/127/6/6AQ5.pdf","https://frank.pocnet.net/sheets/049/6/6AQ5A.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6AQ5","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6aq5.html"},"raw_equivalents":["EL90","6005","6AQ5A","6AQ5W","N727","CV1862","CV8229","M8245","BPM04","CK6005","6L31","5727","M8204"],"equivalents":[],"similar":[{"type_number":"6BM5","reason":"Listed as Sams substitute but different internal construction — verify pin compatibility before substituting","has_detail_page":true},{"type_number":"6HG5","reason":"Listed as Sams substitute with improved characteristics — verify pin compatibility before substituting","has_detail_page":true},{"type_number":"6V6","reason":"RCA notes 6AQ5 curves are same as 6V6 — electrically near-identical but Octal base, not pin-compatible","has_detail_page":true}],"pins":[{"pin_number":"1","function":"Control Grid (Grid No.1)","function_code":"g1","notes":null},{"pin_number":"2","function":"Cathode (+ Beam Forming Plates)","function_code":"k","notes":null},{"pin_number":"3","function":"Heater","function_code":"h","notes":null},{"pin_number":"4","function":"Heater","function_code":"h","notes":null},{"pin_number":"5","function":"Anode (Plate)","function_code":"a","notes":null},{"pin_number":"6","function":"Screen Grid (Grid No.2)","function_code":"g2","notes":null},{"pin_number":"7","function":"Control Grid (Grid No.1)","function_code":"g1","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":"0.45","numeric_value":"0.45","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":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Vs_max","display_name":"Screen Voltage (max)","value":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"12","numeric_value":"12","unit":"W","param_group":"absolute_max"},{"key":"Ps_max","display_name":"Screen Dissipation (max)","value":"2","numeric_value":"2","unit":"W","param_group":"absolute_max"},{"key":"Ik_max","display_name":"Cathode Current (max)","value":"40","numeric_value":"40","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":"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":"-12.5","numeric_value":"-12.5","unit":"V","param_group":"typical_operating"},{"key":"mAa","display_name":"Anode Current","value":"45","numeric_value":"45","unit":"mA","param_group":"typical_operating"},{"key":"mAs","display_name":"Screen Current","value":"4.5","numeric_value":"4.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"52000","numeric_value":"52000","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"4.1","numeric_value":"4.1","unit":"mA/V","param_group":"typical_operating"},{"key":"Rk","display_name":"Cathode Resistor (self-bias)","value":"250","numeric_value":"250","unit":"Ω","param_group":"typical_operating"},{"key":"Pout","display_name":"Output Power","value":"4.5","numeric_value":"4.5","unit":"W","param_group":"output"},{"key":"rl","display_name":"Load Impedance","value":"5000","numeric_value":"5000","unit":"Ω","param_group":"output"},{"key":"Cgp","display_name":"Grid-to-Plate Capacitance","value":"0.4","numeric_value":"0.4","unit":"pF","param_group":"capacitances"},{"key":"Cin","display_name":"Input Capacitance","value":"8.0","numeric_value":"8","unit":"pF","param_group":"capacitances"},{"key":"Cout","display_name":"Output Capacitance","value":"8.5","numeric_value":"8.5","unit":"pF","param_group":"capacitances"}]},{"section_number":2,"section_label":"Triode Strapped","tube_type_key":"power_triode","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"250","numeric_value":"250","unit":"V","param_group":"absolute_max"},{"key":"Pa_max","display_name":"Anode Dissipation (max)","value":"12","numeric_value":"12","unit":"W","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":"49.5","numeric_value":"49.5","unit":"mA","param_group":"typical_operating"},{"key":"ra","display_name":"Anode Resistance","value":"1970","numeric_value":"1970","unit":"Ω","param_group":"typical_operating"},{"key":"gm","display_name":"Transconductance","value":"4.8","numeric_value":"4.8","unit":"mA/V","param_group":"typical_operating"},{"key":"mu","display_name":"Amplification Factor (μ)","value":"9.5","numeric_value":"9.5","unit":"—","param_group":"typical_operating"}]}],"synced_at":"2026-04-07T12:16:02.201Z"}