{"type_number":"6AX5","canonical_url":"https://tubeofile.com/tubes/6AX5","manufacturer":"Tung-Sol","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"Full-wave vacuum rectifier of the heater-cathode type intended for use in AC-operated and automobile receivers. The indirectly-heated cathode construction provides the same heating time as other heater-cathode signal tubes, preventing excessive voltages from appearing across filter capacitors during warm-up.","is_directly_heated":false,"completeness":"high","notes":["Brans Vademecum lists 6AX5GT as equivalent to 6X5. Both share the same Octal pinout (base 6S), 6.3V/1.2A heater, and similar electrical ratings. The 6AX5GT has slightly different heater warm-up characteristics.","The 6AX5GT is already listed as an equivalent of the 6X5 in this repository.","Maximum ratings vary by filter type: with capacitor-input filter, max AC plate voltage is 350V RMS per plate at 10 uF; with choke-input filter, max is 450V RMS per plate.","Effective plate supply impedance limits: 50 ohm per plate minimum for capacitor-input up to 10 uF, 105 ohm per plate minimum for larger capacitors.","Maximum hot-switching transient plate current is 2.6 A (for 0.2 second max duration) — relevant for capacitor-input filter circuits.","The voltage drop is relatively high (~50V at 125mA total) compared to directly-heated rectifiers like the 5Y3 (~60V at 125mA). This is typical of indirectly-heated full-wave rectifiers.","MIL-HDBK-213A classifies this as a full-wave rectifier. No military substitute is listed."],"references":["https://frank.pocnet.net/sheets/127/6/6AX5GT.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6AX5GT","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6ax5gt.html"},"raw_equivalents":["6AX5GT","6X5","6X5GT","CV8280","6AX5-GT"],"equivalents":[{"type_number":"6X5","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"6BW4","reason":"Full-wave rectifier with higher current (100mA) but Noval base — not pin-compatible","has_detail_page":true},{"type_number":"6X4","reason":"Same function (full-wave rectifier, 6.3V heater, 70mA) but B7G miniature base — not pin-compatible with Octal","has_detail_page":true}],"pins":[{"pin_number":"1","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"2","function":"Heater","function_code":"h","notes":null},{"pin_number":"3","function":"Anode 1 (Plate 1)","function_code":"a1","notes":null},{"pin_number":"4","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"5","function":"Anode 2 (Plate 2)","function_code":"a2","notes":null},{"pin_number":"6","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"7","function":"Heater","function_code":"h","notes":null},{"pin_number":"8","function":"Cathode","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":"1.2","numeric_value":"1.2","unit":"A","param_group":"heater"}],"sections":[{"section_number":1,"section_label":"Rectifier","tube_type_key":"rectifier","specs":[{"key":"Va_max","display_name":"Anode Voltage (max)","value":"450","numeric_value":"450","unit":"V","param_group":"absolute_max"},{"key":"Vhk_max","display_name":"Heater-to-Cathode Voltage (max)","value":"450","numeric_value":"450","unit":"V","param_group":"absolute_max"},{"key":"PIV","display_name":"Peak Inverse Voltage","value":"1250","numeric_value":"1250","unit":"V","param_group":"rectifier"},{"key":"Vdrop","display_name":"Voltage Drop (typical)","value":"50","numeric_value":"50","unit":"V","param_group":"rectifier"},{"key":"C_max","display_name":"Max C-input Filter Capacitor","value":"10","numeric_value":"10","unit":"µF","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"375","numeric_value":"375","unit":"mA","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"125","numeric_value":"125","unit":"mA","param_group":"rectifier"},{"key":"Rs_min","display_name":"Min Series Resistance (C-input)","value":"50","numeric_value":"50","unit":"Ω","param_group":"rectifier"}]}],"synced_at":"2026-04-09T05:17:07.087Z"}