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rectifier selenium trust

Life and failures of selenium rectifiers Too often when powering an old radio or an electronic set that uses selenium rectifiers in its power supply section these components fail Symptoms are a quite fast overheating of the rectifiers themselves a considerable reduction of the AC and rice mill crusher in uae

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  • rectifier selenium trust

    Selenium FullWave Bridge Rectifier Testing Drawn by Jon Pardue 2007 Updated 2013 Selenium FullWave Rectifiers 3wire Ground connection Earth connection minus battery terminal Negative battery terminal Chassis ground Cathode Warning Do NOT breathe the smoke from a failing rectifier Evacuate the area Selenium is toxic In England its

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  • rectifier selenium trust

    ¾The Rectifier is used to deliver – or impress –a Direct Current onto a structure ¾The Rectifier has two functions 1 To transform incoming line voltage AC provided by the utility company to

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  • rectifier selenium trust

    Selenium rectifier I would think the drop across a selenium rectifier would be much too high and too variable for satisfactory performance in a low voltage supply but perhaps not There should be ample voltage margin when using a silicon rectifier to permit use of a regulator which would likely make the attached circuitry happier anyhow IMG

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  • rectifier selenium trust

    If a good selenium rectifier is operated at its nominal load current the RMS voltage drop in a circuit such as a VTVM power supply should be 12 volts per cell This is from p 309 of the 4th edition 1957 of Reference Data for Radio Engineers published by ITT

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  • rectifier selenium trust

    Jun 19 2007 · For a time during the 1950s a lot of television sets were made which used selenium rectifiers Even Collins Radio used a selenium rectifier in the SLine power supply 516F2 for the bias voltage rectifier halfwave Ameco used a selenium rectifier halfwave in the power supply for all of their tubetype VHF converters

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  • rectifier selenium trust

    Yeah caps are a no brainer I dont even trust new caps as I have seen a few failures there as well but being as a selenium rectifier is a solid state device correct me if Im wrong then should they not be as reliable as any other solid state device assuming they are not abused shorted electrolytic ect

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  • rectifier selenium trust

    Selenium or Se is a nonmetal that rarely occurs in an elemental state or as a pure ore Discovered by Jons Hacob Berezelius selenium is used in a few of today’s DC power surge protectors With the introduction of vacuum diodes introduced in the early 1900’s rectifiers were limited

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  • rectifier selenium trust

    Mar 30 2005 · On the topic of retaining a selenium rectifier it probably is a really good idea to replace it with silicon diodes I am not a chemist but I understand that when a selenium rectifier fails it can release toxic gas and retaining a selenium rectifier adds unnecessary risk for the power transformer

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  • rectifier selenium trust

    A selenium rectifier is a type of metal rectifier invented in 1933 citation needed They were used in power supplies for electronic equipment and in highcurrent batterycharger applications until they were superseded by silicon diode rectifiers in the late arrival of the alternator in some automobiles was the result of compact lowcost highcurrent silicon rectifiers

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  • rectifier selenium trust

    Selenium Metal Rectifiers Fast Rectifier Diodes Fast Recovery Rectifier Diode High Efficiency Fast Silicon Rectifier Diode Business Type Manufacturer Service Provider Distributor Supplier and Trader

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  • rectifier selenium trust

    May 13 2013 · Trust me you dont want your selenium rectifier to go bad I have seen it many times you will red plate all your output tubes because of no negative bias going to the tubes Selenium rectifiers had a shorter lifespan than desired During catastrophic failure they produced significant quantities of malodorous and highly toxic fumes that let the repair technician know what the problem was

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  • rectifier selenium trust

    Rectifier Preventative Maintenance 5 Clean inspect tighten connections 1 This includes cleaning the tap bars and the structure anode connections 6 Clean all components with a nonmetallic brush old paint brush 1 Air screen panel transformer and rectifying element 2 Plug any extraneous openings 7

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  • rectifier selenium trust

    Another object is to attain an even and fine grained selenium deposit on a baseelement which will be useful for a rectifier or photocell Selenium has heretofore been electrodeposiled cathodically by the use of solutions producing quadrivalent selenium cations Se Such a condition is had in a selenious acid solution conaining an excess of acid as disclosed and claimed in copending application Ser No

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  • rectifier selenium trust

    Nov 21 2007 · rectifiers used to give you the voltage B in this case 250 volts and current rating C in this case 50mA of the device I agree with the other posters that you can replace the selenium with a silicon diode but may need to ad a dropping resistor as the B may be higher because of less loss in the rectifier I usually bring the item

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  • rectifier selenium trust

    Dec 09 2016 · The efficiency of conversion in selenium rectifiers is relatively high usually on the order of 90 percent in threephase fullwave circuits and 70 percent in singlephase fullwave circuits The nonlinear characteristics of selenium rectifiers contribute to high

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  • rectifier selenium trust

    Oct 24 2019 · selenium rectifiers do not age well and need to have the plates reformed much like electrolytic caps that have been in storage or idle for a long time if they have been sitting idle the thing i never liked about selenium rectifiers was the relatively high reverse leakage current

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  • rectifier selenium trust

    The selenium rectifier was damaged physically and I didnt trust it so I replaced it with a silicon AC output voltage was something like 1825 voltsit has a tapped primary to control secondary voltagePWith the bridge in place I have goofy output voltages way too highPI cant think of an econonical way to build a regulator

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  • rectifier selenium trust

    The aluminium based selenium rectifier elements are manufactured by an improved closely controlled vaccum deposition process This new process ensure stable non ageing low loss characteristics permitting higher current density operation while maintaining a reliability standard which has been a by in the selenium rectifier field for over

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  • rectifier selenium trust

    Aug 02 2016 · Re Selenium rectifier danger My observation is that nearly every useful industrial substance is known to the State of California to cause cancer But I dont plan on making CFL lamp stew for supper so I think Ill be OK

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  • rectifier selenium trust

    but trust me on that it isnt Otherwise follow Randys suggestionsSyl Syls Old Radioztm I always make it standard practice on radios that have selenium rectifiers to put a dropping resistor that keeps the B at the voltage the schematics have noted for the respective radio

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  • rectifier selenium trust

    A selenium rectifier is a type of metal rectifier invented in 1933 citation needed They were used in power supplies for electronic equipment and in highcurrent batterycharger applications until they were superseded by silicon diode rectifiers in the late arrival of the alternator in some automobiles was the result of compact lowcost highcurrent silicon rectifiers

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  • rectifier selenium trust

    May 31 2010 · CHELLIE New Member I am making a 120v DC power supply for a HHO hyd generator the DC current will be flowing through water with an electrolite to produce oxy hydrogen Thank you in advance Chellie Power Supplies I remember in High School that someone hooked up a Selenium Rectifier the wrong way to 120v AC It shorted out and stunk up

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  • rectifier selenium trust

    Jul 22 2016 · if you have one of the large metal finned rectifiers selenium its proably bad replace with a new 50v 20 amp full wave bridge or one of the power supplys we talked about Top ago

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  • rectifier selenium trust

    Mar 31 2007 · Been a loooong time since Ive had to deal with selenium rectifiers but conduction characteristics arent anything like a silicon or germanium diode Theyve got a large forward voltage drop and the reverse characteristic isnt anything like completely off In a lot of battery charger circuits they were used as a primitive voltage

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  • rectifier selenium trust

    Selenium is a chemical element with symbol Se and atomic number 34 It is a nonmetal more rarely considered a metalloid with properties that are intermediate between the elements above and below in the periodic table sulfur and tellurium and also has similarities to rarely occurs in its elemental state or as pure ore compounds in the Earth

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  • rectifier selenium trust

    Dec 29 2017 · If the Power Supply selenium rectifier or major caps fail the outcome can be very costly or even cause a fire Get this Fisher to a knowledgeable tube audio repair technician Dont even power it up until that selenium rectifier is replaced

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