Selenium rectifiers

Atmars, There is no option. Selenium rectifiers MUST be replaced by modern Silicon parts. It is INEVITABLE that Selenium rectifiers fail. When they fail, toxic vapor and toxic dust are produced. 🙁 🙁 The 3 A./1000 PIV rated UF5408 will surely survive in your equipment and it's quite likely the 1 A./1000 PIV UF4007 is adequate. Add an inrush current limiting thermistor …

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REPLACEMENT SELENIUM RECTIFIERS

You can replace a selenium bridge rectifier with a modern silicon bridge rectifier that consists of four diodes in a bridge configuration. Voltage Rating: Ensure that the replacement diodes have a sufficient voltage rating to handle the maximum voltage encountered in the application. It's a good practice to provide some margin to ensure ...

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The PHILCO Phorum

If the original selenium rectifier is still working do some voltage measurements to see what the output voltage is before it gets to the filament dropping resistor, and after it. Regards Arran Thanks Arran. I was aware that the filament voltages are 1.4 and 2.8 volts. I referenced them that way to indicate that the set only has 4 tubes a 1R5 ...

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Replacing a selenium rectifier in a jukebox amp

Before I understood the difference (still in college) I replaced a selenium rectifier that had failed, with a silicon diode in an old B/W TV. The TV worked with the replacement, but a vertical white line appeared on the edge of the screen, apparently due to the increased voltage from the silicon diode. I realize now, I should have added a ...

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Selenium Rectifier Presses

BY RICH BONKOWSKI, W3HWJ … age spike might "zap" the selenium film, but it soon heals itself and functions again. • When used in 120 Vrms rectifier circuits, the selenium unit had a drop or loss of only about 5 to 10 volts while the tube rectifier drop was 10 to 25 volts.

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Selenium Rectifiers

On the opposite side of the selenium is the counter electrode which is an alloy whose constitution has considerable influence on the rectifying properties of the junction. Rectifier action takes place at the junction of the counter electrode and selenium where the so-called barrier layer exists.

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Selenium rectifiers

Gadget73 is correct. The usual failure mode of selenium rectifiers is high-resistance. There is an application where this failure mode can be hazardous: where a selenium rectifier is used to produce the negative DC voltage for biasing the grids of …

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Selenium Rectifiers & Suppressors

A selenium rectifier is an electronic component that permits free passage of electric current in one direction, but almost completely blocks the flow of current in the opposite direction. Like a silicon diode, when an alternating current is …

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SMALL SELENIUM RECTIFIERS

Influenee ofthe c~mpositi~ns of a selenium re~tifier upon its proJ_lerties',.-A selenium rectifier may be made.in the following, way: molten selenium ispoured onto ametal carrier plate, serving to lend strength to the whole, then pressed flat and, subjected to a heat treatment, thereby forming' on,the surface of the selenium an

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Selenium Rectifier

The selenium rectifier, pn AEG B250C150K4, had to be replaced. According to prevailing acceptible substitutions, recommended in SAMS Photofact for the model 5299 (which was essentially the model 5295 without speakers), were the 1N540; 1N1763; or the 1N3194.

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Replacing the Selenium Rectifier

the AC power line to the selenium rectifier's anode terminal. Step 2. Disconnect the 130 ohm sand resistor from the cathode terminal (+) of the selenium rectifier. Step 3. The selenium rectifier is attached to the chassis by a long bolt through its center. Remove the nut and washer with a 1/4" wrench. Slide the selenium rectifier off the bolt.

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Selenium Rectifiers, October 1952 Radio and Television News Article

In spite of widespread use, the selenium rectifier is still somewhat of a mystery and enigma to the average engineer and technician. Selenium rectifiers are thermally as well as electrically rated devices; therefore, special precautions must be taken to insure long useful life under adverse conditions.

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Selenium Rectifier Replacement

If the original selenium rectifier is still working do some voltage measurements to see what the output voltage is before it gets to the filament dropping resistor, and after it. Regards Arran Thanks Arran. I was aware that the filament voltages are 1.4 and 2.8 volts. I referenced them that way to indicate that the set only has 4 tubes a 1R5 ...

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RCA Voltohmyst WV-98C selenium rectifier question

voltage drop between the old selenium to new silicon rectifier. You kind of have to do a little substitution experiment and measure voltages to fine tune it. You can do the Ohms law math all day but you have to make assumptions. The WV-98C was designed to work on 117 VAC. My line power is

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Selenium rectifier

In general, a selenium rectifier drops about 1V per cell, so if you count the number of cells (plates) and multiply by 1V, that should give a reasonable idea of the total drop. You, of course, would then have to determine the current draw to select an appropriate value of series resistor to drop that much voltage (or add a series Zener diode of ...

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Selenium Rectifiers

An example of a selenium rectifier stack number is shown at the bottom of the chart. Decoded, this number means that the stack has the following characteristics: The assembly is forced-air cooled (F prefix), the cells are 5 by 6 inches (code S), they have a 33 volt rating, they are Hi-Density type, they are circuited as a single-phase bridge (code B), and two of them are used in …

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selenium rectifier presses

United States patents on powder metallurgy - GovInfo,machines used in powder metallurgy, such as grinding mills, presses, briquetting machines Selenium rectifier comprising selenium pow- der deposited. Selenium rectifier - Wikipedia,A selenium rectifier is …

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Selenium Rectifiers & Surge Suppressors

Troubleshooting a selenium rectifier or suppressor. Our customer service will be happy to help you to determine what's the best solution. Find parameters for rectifiers : Voltages: Standard Voltages per cell up to 36 v rms. The voltage …

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Selenium rectifiers and their design

Selenium rectifiers are dry-plate rectifiers of the electronic type. The history of dry rectifiers began some 30 years ago with the advent of the copper-sulphid.

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Replacing a selenium rectifier with a silicon one

Input voltage: 120 VAC metered and carefully set Output voltage with selenium rectifier: 133.9 volts DC resulting in 260 MA Output voltage with silicon rectifier: 141.3 volts DC resulting 270 MA Measurements were made with a Fluke 179 multimeter for AC and DC voltages, a Simpson 260 for DC current. The circuit was a simple half-wave rectifier ...

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Help needed

That looks to me to be a small selenium bridge rectifier. I gather that the two blue terminals at the ends are tied to one another? If so, AC in on yellow, and my *guess* is that the red terminal is the common cathode connection of the bridge (the + DC point) and that the two blue terminals are the common anode connection on the bridge (the - DC point).

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Selenium rectifiers: failures and restoring tips

Selenium rectifiers were made depositing a tin layer of selenium between steel or aluminum plates and counter electrodes, sometimes spring-loaded. Reverse voltage rating of each cell could vary from 18 to about 30 volts, depending …

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selenium rectifier

Sometimes after a change from the selenium rectifier to the diode SOME amps will require a change in the resistors on the 7 lug terminal strip in order to bias the amp properly. Usually the easiest thing to do is to replace the two 10 K resistors between lugs 1 and 2 and lugs 3 and 4 with two 5 K resistors. This resistor change should get your ...

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Selenium rectifier

A selenium rectifier is a type of metal rectifier, invented in 1933. [1] They were used in power supplies for electronic equipment and in high-current battery-charger applications until they were superseded by silicon diode rectifiers in the late 1960s. The arrival of the alternator in some automobiles was the result of compact, low-cost, high-current silicon rectifiers.

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Selenium Rectifiers & Surge Suppressors

Selenium rectifiers and suppressors are still used in the industry for their strong reliablity. This technology has been mainly replaced by silicon diodes, providing a better efficiency and lower voltage drop. Selenium …

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Selenium Rectifier

A selenium rectifier element refers to the selenium wafer or disc used as the rectifying material in a selenium rectifier. The element typically consists of a cylindrical or disc-shaped piece of …

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Testing a Selenium Rectifier – Syscomp Electronic …

Selenium rectifiers are recognizable by the cooling fins, which are often painted green or orange. We were given a three-phase selenium rectifier, taken from an ancient Honda 150 motorcycle. The alternator is wired to …

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Selenium rectifier replacement

The selenium rectifier is old tec. Today we use silicon rectifier there far less leaking over the old low cost selenium rectifier. Go to Amazon and find a rectifiers Dave FYI: I have replace a lot of selenium with silicon. The only you may is increase voltage and less heat.

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Selenium Rectifiers and Their Design

The paper includes dynamic and other characteristics of the principal sizes of selenium rectifier plates as applied to the design of single-phase, three-phase, full-wave, and …

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RECIIFIER INDIANA

The radio "Centre-Kooled" selenium rectifier has found wide application in all phases of radio, television and electronic design. This versatile unit has completely changed concepts of D. C. power supply design. Where it had previously been con­ sidered impractical to use voltage multiplier circuits because of complicacy of supply­ ...

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