{"type_number":"6202","canonical_url":"https://tubeofile.com/tubes/6202","manufacturer":"Tung-Sol / GE / RCA / Amperex","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"B7G","description":"Full-wave high-vacuum rectifier, 7-pin miniature construction. Twin diode designed for power supplies in mobile and aircraft applications, with enhanced heater-cathode ratings and altitude specification. Electrically a ruggedised, altitude-rated variant of the 6X4.","is_directly_heated":false,"completeness":"high","notes":["Industrial/high-reliability variant of the 6X4 with tightened ratings and altitude qualification (to 60,000 ft). The 6202 is a direct replacement for the 6X4 in ordinary service.","DC output current is altitude-derated: ~55 mA max total DC output per rectifier_reference.json (down from 70 mA on the 6X4) to accommodate reduced cooling and voltage-breakdown margin at altitude.","Heater-cathode voltage limits are asymmetric: +100 V (heater positive) / 450 V (heater negative) — matters for elevated heater supplies.","Peak inverse voltage rating drops from 1250 V at altitudes ≤ 40,000 ft to 850 V above 40,000 ft due to socket/voltage-breakdown concerns at reduced pressure.","Common-cathode topology (single shared cathode on pin 7) — not suitable for voltage-doubler use.","Vdrop 22 V measured at 50 mA per plate (choke-input, per Tung-Sol 1963 datasheet)."],"references":["https://frank.pocnet.net/sheets/127/6/6202.pdf","https://www.radiomuseum.org/tubes/tube_6202.html"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6202","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6202.html"},"raw_equivalents":["6X4","EZ90","CV493"],"equivalents":[{"type_number":"6X4","equivalence_type":"direct","notes":null}],"similar":[{"type_number":"12X4","reason":"Electrically identical but 12.6V heater — not a drop-in in 6.3V circuits","has_detail_page":true},{"type_number":"6X4WA","reason":"Ruggedised 6X4 — pin-compatible but different maximum ratings (not altitude-qualified like 6202)","has_detail_page":false}],"pins":[{"pin_number":"1","function":"Plate 2 (Anode 2)","function_code":"a2","notes":null},{"pin_number":"2","function":"No Connection","function_code":"nc","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":"No Connection","function_code":"nc","notes":null},{"pin_number":"6","function":"Plate 1 (Anode 1)","function_code":"a1","notes":null},{"pin_number":"7","function":"Cathode (common)","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":"0.6","numeric_value":"0.6","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":"22","numeric_value":"22","unit":"V","param_group":"rectifier"},{"key":"C_max","display_name":"Max C-input Filter Capacitor","value":"4","numeric_value":"4","unit":"µF","param_group":"rectifier"},{"key":"Ia_peak","display_name":"Peak Anode Current (surge)","value":"200","numeric_value":"200","unit":"mA","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"55","numeric_value":"55","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-09T05:16:43.453Z"}