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selenium rectifier presses

  • Trade catalogs from Radio Receptor Co. Inc. National

    "Seletron" selenium rectifiers "Powerizer" Also in New York City sound systems and speakers super amplifiers centralized radio audio racks transmitters ultra-high frequency antennas "schoolmaster" radio intercommunication and record reproducing sound system (1940) interesting fold-out electronic schematic diagrams

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  • Selenium rectifiers (Barry L. Ornitz)

    Remember that selenium rectifiers have a much greater forward voltage drop with current than do silicon diodes. Thus when you replace a selenium diode with a silicon diode expect a higher voltage out of your circuit. For most selenium stacks the DC output is about 2 volts less than the RMS input voltage multiplied by the number of plates.

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  • Made in CT Cougar Electronics Corp. Selenium Rectifiers

    Cougar is a manufacturer of selenium rectifiers and suppressors for industrial applications. Along with these type of semiconductors we make silicon rectifiers and assembly mainly for high voltage and high power. We also fabricate power supplies used in the plating

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  • Old Time Selenium RectifiersCan someone explain them

    Sep 22 2005 · Selenium rectifiers are allso semiconductor devices but amorphouse. In old days we used to say taht each plate of rectifier can whithstand about 30V of reverse voltage and that each square centimeter of it s surface can whitstand 100mA of current. You should count number of plates connected in series and calculate area of plate.

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  • O10FACTamericanradiohistory

    an open rectifier is indicated by the same extremely high reading in forward and reverse directions. Reverse Leakage The blocking quality of a selenium receiver stack may be measured in several ways. Probably the simplest and most convenient test circuit is that illustrated in Figure 1. Polarity of rectifier connection in this circuit

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  • After Class Working with Selenium Rectifiers September

    Jun 12 2012 · Per Wikipedia "A selenium rectifier is a type of metal rectifier invented in 1933. They were used to replace vacuum tube rectifiers in power supplies for electronic equipment and in high current battery charger applications. The photoelectric and rectifying properties of selenium were observed by C. E. Fitts around 1886 but practical

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  • Selenium Rectifier Voltage Drop Electronics Forums

    Jul 11 2003 · was put in series with the silicon diode to make it look more like the selenium stack. Don-----dant posted << I am restoring an older tube short wave radio that contains a selenium rectifier for the high voltage power supply. I ve replaced it with a silicon diode however the lower voltage drop of the diode requires an

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  • selenium rectifier products for sale eBay

    Get the best deals on selenium rectifier when you shop the largest online selection at eBay. Free shipping on many items Browse your favorite brands affordable prices.

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  • Creep and forming in selenium rectifiersScienceDirect

    If the rectifier is cooled part of the molten selenium freezes increasing the local current which provides the necessary increase of heat generation to maintain a molten center in a cooler environment. A typical classical current-time graph Fig. 1 showing positive and negative creep and switch-off effects may now be readily interpreted.

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  • Antique Radio Forums • View topicSelenium Rectifier

    Ah.. the selenium rectifier.. the Rodney Dangerfield of the electronics world. I offer no opinion whether to keep or replace as this subject has already been beaten to death. But I offer an observation from my years on the repair bench.. man oh man did we make a lot of money replacing defective silicon rectifiers and other parts they took out.

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  • Selenium rectifiers failures and restoring tips

    Actually in case of rectifier failure both the rectifier itself and the power transformer become hot and other secondary voltages are significantly low. Then the failure mechanism must be different. Selenium rectifiers were rated for almost infinite continuous service life over than 60.000 hours according to the 1951 GE ad below.

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  • Selenium RectifiersThomasNet

    Jul 22 2020 · Distributor of selenium rectifiers. Available as DC type high voltage selenium rectifiers with voltage ratings from 90 VDC to 675 VDC. Selenium rectifiers are available in current ratings from 3 A to 904 A. High voltage selenium rectifiers are used in electronic braking crane applications.

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  • Selenium Rectifiers SpringerLink

    Selenium rectifiers have been widely used for many years in general purpose rectifying circuits and still provide an economic and simple rectifier for a variety of applications. Since their original practical realisation the basic structure has remained unchanged improvements being generally in methods of manufacture and processing which have

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  • SeleniumWikipedia

    Selenium is a chemical element with the 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 arsenic rarely occurs in its elemental state or as pure ore compounds in the Earth s crust.

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  • Selenium rectifiers failures and restoring tips

    Actually in case of rectifier failure both the rectifier itself and the power transformer become hot and other secondary voltages are significantly low. Then the failure mechanism must be different. Selenium rectifiers were rated for almost infinite continuous service life over than 60.000 hours according to the 1951 GE ad below.

    Read More
  • power electronicsIs this a selenium rectifier

    If it is a selenium rectifier is the 20v per plate Vrev not a problem If it is selenium would that material s properties (e.g. current-limiting (per wikipedia)) be advantageous in this application (large switching inductive load) compared to a diode-based rectifier with a similar power rating

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  • SELENIUM SURGE SUPPRESSORCEHCO

    CEHCO surge suppressors are assembled from high-quality selenium cells. We are selenium surge suppressor replacement specialist. These suppressors are characterized by extremely smooth operation.They pass increasing amounts of current as the voltage increases without the sudden changes that tend to characterize other types of surge suppressors.

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  • USALacquerGoogle Patents

    USA USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords selenium lacquer parts cellulose acetate acetate Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

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  • Testing a Selenium RectifierSyscomp Electronic Design

    Oct 25 2016 · The selenium rectifier replaced the vacuum tube rectifier in the period 1950 onward and was in use until the 70 s. Selenium rectifiers are recognizable by the cooling fins which are often painted green or orange. We were given a three-phase selenium rectifier taken

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  • Problem with replacing selenium rectifier All About Circuits

    Sep 01 2019 · I ve experimented with selenium rectifiers and even burned one. I disassembled it and found many square elements. You can simulate selenium diodes with high-voltage silicon diodes. They also consist of a series of sequentially connected diodes and many volts fall on them. The higher the voltage diodes the greater the voltage drop. See 2CL69

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  • About InfineonInfineon Technologies

    Find all information about the company Infineon Technologies like press tradeshows conferences csr management more. InfineonYour partner for innovative Technologies.

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  • power electronicsIs this a selenium rectifier

    If it is a selenium rectifier is the 20v per plate Vrev not a problem If it is selenium would that material s properties (e.g. current-limiting (per wikipedia)) be advantageous in this application (large switching inductive load) compared to a diode-based rectifier with a similar power rating

    Read More
  • USALacquerGoogle Patents

    USA USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords selenium lacquer parts cellulose acetate acetate Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

    Read More
  • 1967 Kohler 6.5 kw with L600 engine replacing selenium

    Apr 18 2019 · The kit sold to replace the selenium rectifier consisted of a 25A full wave bridge rectifier the type of which you see as a black "cube" with four 1/4" push on terminals. It was supplied with a "puck" style GE MOV that was to be wired across the bridge to absorb spikes/transients that occur when the generator has a load removed or

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  • Basics Selenium RectifiersYouTube

    Dec 30 2018 · Grundig 3160 tube radio restoration part 6. Selenium rectifier filter caps and FM alignment.Duration 42 17. Electronics Old and New by M Caldeira 2 445 views

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  • Replacing the selenium rectifier in a vintage car battery

    Selenium rectifiers have a higher voltage drop than modern ones so maybe the circuit was dependent on that to get the right voltages. Or the voltages where so high to equalize the cells and was designed for batteries where you d fill water in them I think those had higher charge voltages. endgroup Arsenal Aug 15 17 at 9 29

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  • Problem with replacing selenium rectifier All About Circuits

    Sep 01 2019 · I ve experimented with selenium rectifiers and even burned one. I disassembled it and found many square elements. You can simulate selenium diodes with high-voltage silicon diodes. They also consist of a series of sequentially connected diodes and many volts fall on them. The higher the voltage diodes the greater the voltage drop. See 2CL69

    Read More
  • Replacing the selenium rectifier in a vintage car battery

    Selenium rectifiers have a higher voltage drop than modern ones so maybe the circuit was dependent on that to get the right voltages. Or the voltages where so high to equalize the cells and was designed for batteries where you d fill water in them I think those had higher charge voltages. endgroup Arsenal Aug 15 17 at 9 29

    Read More
  • RECTIFIER SELECTION OPERATION MAINTENANCE

    9Backhand Rule Touch the rectifier enclosure with the back of your hand 9De‐energize If possible disconnect the power at the source 9One‐Hand Rule If possible work within the enclosure with only one hand 9Look Away When energizing the rectifier look away or cover your face

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  • Selenium Rectifiers SpringerLink

    Selenium rectifiers have been widely used for many years in general purpose rectifying circuits and still provide an economic and simple rectifier for a variety of applications. Since their original practical realisation the basic structure has remained unchanged improvements being generally in methods of manufacture and processing which have

    Read More
  • Selenium RectifierRadiomuseum

    Mar 30 2005 · About selenium rectifiers it is easy to calculate the value of voltage dropping resistor simply by Ohms law. I = E/R (europians are using U symbol instead of E for voltage). So if you need to drop 25 volts and total current is 0.1 A reverse Ohms law to R= E/I ( 25 volts / 100 mA )= 250 Ohms.

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  • Life and failures of selenium rectifiers

    Selenium rectifiers were rated for almost infinite continuous service life over than 60.000 hours according to this . 1951 GE ad. In comparison high-rel vacuum tubes had life expectancies between 5.000 and 10.000 hours. Failures in selenium rectifiers are therefore unrelated with their age. In the collection there are many old radios and

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  • Selenium rectifiers failures and restoring tips

    Actually in case of rectifier failure both the rectifier itself and the power transformer become hot and other secondary voltages are significantly low. Then the failure mechanism must be different. Selenium rectifiers were rated for almost infinite continuous service life over than 60.000 hours according to the 1951 GE ad below.

    Read More
  • Selenium rectifier danger Smokstak® Antique Engine

    Aug 02 2016 · Yeah selenium rectifiers were the popular "solid state" rectifier to get around 5U4 and other high vacuum rectifiers. As a teen I was given a Korean( ) war vintage US Army 12v/28v power supply/battery charger for tanks trucks radio s etc. (Larger than the early Litton Microwave ovens.)

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  • (PDF) The Copper Oxide RectifierResearchGate

    4 The copper oxide rectifier was replaced eventually by the selenium rectifier which had been invented around 1925 by E. Presser. However copper oxide rectifiers still had a large market

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  • Selenium RectifierRadiomuseum

    Mar 30 2005 · About selenium rectifiers it is easy to calculate the value of voltage dropping resistor simply by Ohms law. I = E/R (europians are using U symbol instead of E for voltage). So if you need to drop 25 volts and total current is 0.1 A reverse Ohms law to R= E/I ( 25 volts / 100 mA )= 250 Ohms.

    Read More
  • Basics Selenium RectifiersYouTube

    Dec 30 2018 · Grundig 3160 tube radio restoration part 6. Selenium rectifier filter caps and FM alignment.Duration 42 17. Electronics Old and New by M Caldeira 2 445 views

    Read More

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