selenium rectifier replacement

selenium rectifier replacement

SELENIUM RECTIFIER - CEHCO

Selenium rectifier stacks are made up of selenium cells, which are mounted together and circuited as required for each application. They are available in configurations to suit all of the rectifier circuits. CEHCO is a leader in supplying selenium rectifier stacks. We are selenium rectifier replacement

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BY RICH BONKOWSKI, W3HWJ

2018-4-20  ment. Two small selenium “stacks” could easily replace a type 80 or 5Y3 vacuum tube rectifier in many circuits. Since each plate of the selenium stack could support about 30 volts, you will typ-ically find 5 or 6 plates in a 120 Vrms rectifier. Tube rectifiers need filament power to ther-mally stimulate electron flow. The 5Y3, for exam-

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Replacing Selenium Rectifiers in Zenith Trans-Oceanics

Fortunately, a Selenium rectifier is easily replaced with a silicon diode; however, added resistance (typically a 40-50 ohm, 5 watt resistor along with the existing 130 ohm "sand" resistor) or a larger voltage dropping resistor in place of the original resistor (typically a 170-180 ohm, 5-watt resistor) is needed to compensate for the lower forward voltage drop of the silicon diode.

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Replacing a selenium rectifier - Antique Radio Forums

With a centertapped transformer, you can make a full-wave rectifier with just two diodes, and this was usually done with a dual diode tube like 5Y3 or 5U4 or 80.In the cheapest radios (and in those used for AC-DC operation), no transformer was used, so a half-wave single diode rectifier was the solution, either using a single diode tube like 35Z5 or 35W4, or a selenium rectifier.

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Life and failures of selenium rectifiers

2021-3-10  What can be done if the selenium rectifier is defective and must be replaced? In this case we can try to repair the old rectifier using silicon diodes, as in this

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Problem with replacing selenium rectifier All About

2019-9-1  I’m recapping a small preamp and want to replace the selenium rectifier. This is on an analog chime system that has small pickups on little chime bars that are struck by solenoids. The preamp is built around a 12AX7 tube. I finished the recap and verified all the resistors are in tolerance.

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Selenium Rectifier - Radio Museum

2005-3-30  Replacement of a selenium rectifier In prinziple (for others): If you don't know the consumption (Amps.) you have to know either by the schematic or often you can read the ratings of the old rectifier. In any case you need to know the current you want to rectify. Second you need to know what voltage you should get after rectification.

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Always, always, always replace the bias selenium

2014-12-23  Depending where you set your bias and input line voltage, I would say 1.7 amps would be the maximum the ST-70 should pull at idle. To check the selenium rectifier, unplug the amplifier, wait a few minutes so all the voltages will bleed off then put your meter on R X 1 scale and measure the selenium rectifier, you should get meter movement one way and no movement when you reverse your

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Herrmann Silicon, Selenium, rectifier and plate.

2012-5-22  Selenium rectifiers stacks and selenium surge suppressor herrmann HALBLEITER GmbH // Industriestraße 83a // D-90537 Feucht Tel: +49 9128 - 605-11 // Fax: +49 9128 - 605-19 // E-Mail: [email protected]

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Selenium Rectifier Handbook (Sarkes Tarzian Company)

2017-3-21  SELENIUMRECTIFIER Model200 200MA130VMax. CHARACTERISTICS Max.RMSInputVoltage, 130 Max.InversePeakVoltage 380 Max.PeakCurrent(MA) 2000 Max.RMSCurrent (MA) 500 Max.DCCurrent(MA) 200 ApproximateRectifierVoltageDrop.... 5 MinimumSeriesResistance(Ohms) 5 Max.OperatingPlate Temperature 85°C DIMENSIONSININCHES

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Replacing a selenium rectifier - Antique Radio Forums

The purpose of the resistor is to drop same voltage that gets dropped by the selenium rectifier. A silicon diode will drop 0.7v while the selenium rectifier may drop anywhere between 5 and 20 Volts (or more) Measure the drop is a good starting point but keep in mind it might not be accurate as it tends to drop more as it ages (I guess that's why they overheat and burn)Experiment by ...

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Replacing Selenium Rectifiers in Zenith Trans-Oceanics

Replacing Selenium Rectifiers in Zenith Trans-Oceanics All the miniature tube Trans-Oceanics, from the G500 to the B600, were equipped with selenium rectifiers instead of the traditional tube rectifier. Selenium rectifiers are notorious for failing gradually over time. Their forward voltage drop increases to the point that the tubes stop working.

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Selenium rectifier replacement GroupDIY

2007-10-24  Selenium rectifier replacement. Thread starter emrr; Start date Oct 23, 2007; Help Support GroupDIY: emrr Well-known member. Joined Apr 12, 2006 Messages ...

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SELENIUM RECTIFIER - CEHCO

ABOUT SELENIUM RECTIFIER. Selenium rectifier stacks are made up of selenium cells, which are mounted together and circuited as required for each application. They are available in configurations to suit all of the rectifier circuits. CEHCO is a leader in supplying selenium rectifier stacks. We are selenium rectifier replacement specialist.

Read More
How do I replace this 40+ year old selenium rectifier ...

2004-6-14  One side of the selenium rectifier will be marked with a plus (+). The new rectifier will replace the old one, but the striped end goes to where the + end of the selenium was. By process of elimination, the unstriped end goes to where the other selenium rectifier lead was. The selenium rectifier should be

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Selenium Rectifier Replacement - Philco radio

2015-2-22  Selenium Rectifier Replacement. Joe Rossi Senior Member. Posts: 405 Threads: 24 Joined: Sep 2009 City: Otter Lake, MI #1. 02-15-2015, 06:01 PM . I am gathering parts for a little Zenith L403 ac/dc radio from the early '50's. It has a selenium rectifier (Zenith p/n 212-5), and says it's rated for 75 ma, no more info.

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amplifier - Replacing selenium rectifier diode with ...

2020-8-17  Replacing selenium rectifier diode with silicon 1N4007. Ask Question Asked 9 months ago. Active 9 months ago. Viewed 541 times 0 \$\begingroup\$ I want to replace this selenium diode on an old tube amplifier with a silicon equivalent. Normally, this diode would have a lower value resistor in series with it such as a 15 ohm.

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Two Wire Selenium Rectifier Replacement lilHonda

2013-8-10  Two Wire Selenium Rectifier Replacement. Discussion in 'General' started by antiqueynot, Aug 8, 2013. antiqueynot New Member. Joined: May 31, 2013 Messages: 10 Likes Received: 0. I am working on a 1970 CT70 and the selenium rectifier is missing. Is there a Radio Shack substitute ? I've seen a 4 wire set up and wiring diagram, but is there a 2 ...

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Life and failures of selenium rectifiers

2021-3-10  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 quite different. Selenium rectifiers were rated for almost infinite continuous service life, over than 60.000 hours, according to this . 1951 GE ad. In ...

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Herrmann Silicon, Selenium, rectifier and plate.

2012-5-22  herrmann - your specialist for rectifiers. As an supplier for semi-conductor products we offer a specific know-how in the field of rectifier technology and an extensive range of products.. Our list of products ranges from standard diodes with wires to silicon rectifier stacks and selenium rectifier stacks, which can also be manufactured in smaller quanitities and in accordance to your ...

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REPLACEMENT SELENIUM RECTIFIER SPECIALIST -

CEHCO is a leader in supplying selenium rectifier stacks. We are selenium rectifier replacement specialist. In fact, the company can assemble and deliver any selenium rectifier in 48 hours or less. And the stacks contain extremely high-quality, high-density, vacuum-processed cells to ensure uniformity, stability, and long life.

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Selenium Rectifier Replacement - ulang

Selenium Rectifier Replacement. A selenium rectifier is a type of rectifier that uses selenium a chemical element that is not a metal as a semiconductor for electrical conductivity For a certain period of time the selenium rectifier enjoyed popularity as perhaps the most widely used rectifier Silicon rectifiers eventually took over this title.

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Selenium rectifier replacement GroupDIY

2007-10-24  Selenium rectifier replacement. Thread starter emrr; Start date Oct 23, 2007; Help Support GroupDIY: emrr Well-known member. Joined Apr 12, 2006 Messages ...

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How do I replace this 40+ year old selenium rectifier ...

2004-6-14  One side of the selenium rectifier will be marked with a plus (+). The new rectifier will replace the old one, but the striped end goes to where the + end of the selenium was. By process of elimination, the unstriped end goes to where the other selenium rectifier lead was. The selenium rectifier should be

Read More
Always, always, always replace the bias selenium

2014-12-23  Depending where you set your bias and input line voltage, I would say 1.7 amps would be the maximum the ST-70 should pull at idle. To check the selenium rectifier, unplug the amplifier, wait a few minutes so all the voltages will bleed off then put your meter on R X 1 scale and measure the selenium rectifier, you should get meter movement one way and no movement when you reverse your

Read More
Selenium Rectifier Replacement - Philco radio

2015-2-22  Selenium Rectifier Replacement. Joe Rossi Senior Member. Posts: 405 Threads: 24 Joined: Sep 2009 City: Otter Lake, MI #1. 02-15-2015, 06:01 PM . I am gathering parts for a little Zenith L403 ac/dc radio from the early '50's. It has a selenium rectifier (Zenith p/n 212-5), and says it's rated for 75 ma, no more info.

Read More
Two Wire Selenium Rectifier Replacement lilHonda

2013-8-10  Two Wire Selenium Rectifier Replacement. Discussion in 'General' started by antiqueynot, Aug 8, 2013. antiqueynot New Member. Joined: May 31, 2013 Messages: 10 Likes Received: 0. I am working on a 1970 CT70 and the selenium rectifier is missing. Is there a Radio Shack substitute ? I've seen a 4 wire set up and wiring diagram, but is there a 2 ...

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Tweed Tremolux--Replacing Selenium Rectifier

2012-10-11  The selenium rectifier is in fact a diode, or series of diodes. Often found on older electric model transformers, and old motorcycles. They're fairly robust, category of if it ain't bust don't fix it, but can short out (bad!) or go open circuit. Yes, they can be replaced with "proper"solid state diodes

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selenium rectifier QRZ Forums

2015-12-18  Do you specifically need a selenium rectifier because of some desired characteristic, or would a modern silicon replacement do the job? If you just need to rectify AC to DC, then a silicon rectifier will do a much better job. If you need to replace a rectifier in a device I

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Selenium Rectifier Handbook (Sarkes Tarzian Company)

2017-3-21  SECTION1 DIMENSIONALDIAGRAM Thedimensionaldiagramshownbelowistobeusedforthe determinationofthedimensionsof"Centre-Kooled”Selenium Rectifiersforradio ...

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