{"type_number":"6ZY5-G","canonical_url":"https://tubeofile.com/tubes/6ZY5-G","manufacturer":"Tung-Sol","tube_type_key":"rectifier","tube_type_display_name":"Rectifier","base_name":"Octal","description":"Indirectly-heated full-wave high-vacuum rectifier designed for receivers with small load currents, where heater-power economy is desired. Very low heater draw (6.3 V/0.3 A) and modest 40 mA DC output make it a natural fit for low-power receivers and single-ended Class A output stages.","is_directly_heated":false,"completeness":"high","notes":["JEDEC base 6S — 6-pin Octal (pins 4 and 6 are unused). Uses the standard Octal socket with the same pinout as the 6X5/6X5-G/6W5-G family.","Tung-Sol datasheet (Feb 1940) states 40 mA max DC output with either condenser or choke input filter, and a tube voltage drop of 18 V at 40 mA per plate. Max AC plate voltage (RMS per plate) is 325 V with condenser input or 450 V with choke input; the more conservative 325 V figure is recorded in Va_max here.","Very low heater current (0.3 A) — about one-third that of the 6X5 family — makes this tube attractive for low-power receivers and small AC/DC sets where heater budget is tight.","Datasheet note: when filter capacitors larger than 40 µF are used, additional plate-supply impedance may be necessary to limit peak plate current.","Max heater-to-cathode potential is 450 V DC — on par with other 6.3 V indirectly-heated rectifiers."],"references":["https://frank.pocnet.net/sheets/127/6/6ZY5G.pdf"],"source_urls":{"r_type":null,"tdsl":"https://tdsl.duncanamps.com/show.php?des=6ZY5G","radiomuseum":"https://www.radiomuseum.org/tubes/tube_6zy5g.html"},"raw_equivalents":[],"equivalents":[],"similar":[{"type_number":"6W5-G","reason":"Same Octal 6S pinout but much higher current rating (100 mA vs 40 mA) — pin-compatible upgrade path","has_detail_page":true},{"type_number":"6X5-GT","reason":"Same Octal 6S pinout and heater voltage but higher current rating (70 mA vs 40 mA) and higher Vdrop (22 V vs 16.5 V) — 6X5 can replace 6ZY5-G but not the reverse in high-current circuits","has_detail_page":false}],"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 2 (Plate 2)","function_code":"a2","notes":null},{"pin_number":"4","function":"No Connection","function_code":"nc","notes":null},{"pin_number":"5","function":"Anode 1 (Plate 1)","function_code":"a1","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":"0.3","numeric_value":"0.3","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":"325","numeric_value":"325","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":"18","numeric_value":"18","unit":"V","param_group":"rectifier"},{"key":"Idc_max","display_name":"Max DC Output Current (total, not per-anode)","value":"40","numeric_value":"40","unit":"mA","param_group":"rectifier"}]}],"synced_at":"2026-04-09T05:17:36.685Z"}