Selenium Rectifier

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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.

FDP Forum

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Jul 16, 2010· With a probe you'll just take a reading looking for current, wattage plate voltage. If it needs adjusting you'll simply adjust the bias range resistor's value, which is the resistor ahead of the selenium rectifier (or diode if it has been updated, as is often the case with tweeds), or the 56k bias resistor after the rectifier or diode.

Selenium rectifier danger! SmokStak

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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.) ... Selenium rectifier danger!

Selenium Rectifier Replacement

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Dec 30, 2012· Help; Hello Guest, Please feel free to join us! ... a Zenith Model Y723 that needs a new rectifier or preferably, a diode replacement. I looked on ebay for a NOS selenium rectifier to no avail. Zenith has several listed in their parts list such as a Federal 1101A or a Tarzian 100A but I couldn't' find these. The current rating is .071A.

Restoration of Your Zenith TransOceanic

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Note that shorted rectifiers are commonly found, particularly 117Z3, a result of operation of the radio with leaky or shorted filter capacitors. A similar effect is observed with selenium rectified radios, if the filters are bad the rectifier is sure to be bad as well.

BY RICH BONKOWSKI, W3HWJ REPLACINGSELENIUMRECTIFIERS

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companies began to make commercial rectifiers by evaporating selenium onto small plates of steel or aluminum. These rectifiers were a real breakthrough in improving the efficiency of electronic equipREPLACINGSELENIUMRECTIFIERS Typical selenium rectifiers. BY RICH BONKOWSKI, W3HWJ 3568 SOUTHRIDGE DR., SANTA, ROSA, CA 95403

Selenium Rectifiers and Their Design IEEE Journals ...

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Abstract: Selenium rectifiers are dryplate rectifiers of the electronic type. The history of dry rectifiers hegan some 30 years ago with the advent of the coppersulphide rectifier. In the early 20' s, the copperoxide type came into common use, and during the past three years, selenium rectifiers have found wide application in American industry.

Problem with replacing selenium rectifier | All About Circuits

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Sep 01, 2019· Way back when, not really knowing what I was doing where a little knowledge is a dangerous thing, I replace a platevoltage selenium rectifier that had failed with a silicon rectifier in an old tube TV, without any other changes. The TV then worked but had a bright edge along one side of the CRT display which was the edge of the scan.

Metal rectifier Wikipedia

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A metal rectifier is an early type of semiconductor rectifier in which the semiconductor is copper oxide or were used in power applications to convert alternating current to direct current in devices such as radios and battery chargers. Westinghouse Electric was a major manufacturer of these rectifiers since the late 1920s, under the trade name Westector (now used as a trade name ...

Replacing selenium rectifier with diode Gearslutz

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May 10, 2014· As Mr. Roth said, the selenium rectifier appears to be used to create DC voltage for the tube filaments. If you look at the schematic on page 20, you see that the rectifier looks like two diodes drawn together with a common cathode. And then a series resistor (R60).

Replacing capacitors in an old Telefunken radio | Page 2 ...

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Apr 05, 2016· I recently recapped a Telefunken Andante 5353W. Also, I converted the old selenium rectifier to a full wave bridge silicon rectifier using 1n4007 diodes with .0047 ceramic capacitors in parallel to each diode to prevent noise on the AM dial.

Change Selenium Rectifier to Silicon Diode

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I have two Knight Star Roamer Radios with selenium rectifiers and I fixed one so far but the other one has a problem, if I change the selenium rectifier to a diode the dc reads negative but read postive with the selenium rectifier but to low a voltage. Who wants to help? Lincoln here!

Selinium rectifyer help/replacement

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Feb 25, 2015· The trouble with selenium rectifiers is that they are inefficient, having much higher resistance than solid state diodes and therefore generate excess heat when in use which is why they have cooling fins. So your rectifier getting warm is probably normal, unless it still gets warm with the motor disconnected.

Selenium rectifier Wikipedia

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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.

Replace Selenium rectifier with silicon diodes YouTube

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Jan 02, 2016· Tube radios from the 50s often have selenium rectifiers in the power supply, which may need to be replaced, preferably with a silicon diode bridge. This is the case here. I …

Old Time Selenium Rectifiers Can someone explain them ...

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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.

Selenium and Silicon Rectifiers YouTube

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Jan 17, 2012· Please Rate Comment and SUBSCRIBE! This feature is not available right now. Please try again later.

Selenium Rectifier Handbook (Sarkes Tarzian Company ...

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Identifier Selenium_Rectifier_Handbook_SarkesTarzian_Company Identifierark ark:/13960/t6644zw7t Ocr ABBYY FineReader Pages 45 Ppi …

SELENIUM RECTIFIER CEHCO

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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. ... Selenium rectifier listed Selenium rectifier help Power assemblies – Selenium rectifiers and suppressors Testing a Selenium Rectifier

Selenium Rectifier Voltage Drop | Electronics Forums

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Jul 11, 2003· was put in series with the silicon diode to make it look more like the selenium stack. Dondant 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

Seth Arp Restores a Zenith H AM FM Tabletop

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Seth Arp Restores a Zenith H‐845 AM‐FM Tabletop by Thomas Bonomo K6AD The Zenith 8‐tube H‐845 AM‐FM radio was built in 1964, and is a popular set thanks to its “high fidelity” sound.

Viking 2 CDC selenium rectifier and replacement | QRZ Forums

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Oct 01, 2019· Replace selenium rectifiers with either a full or half wave diode bridge and a suitable voltage dropping resistor. I use 1n5408 3A diodes (bought a 100 pack deal that will last me forever). Resistor values between roughly 525 ohms are typical to emulate the high losses in selenium rectifiers.

Selenium rectifiers: how to preserve them?

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Dec 03, 2008· Selenium rectifiers were made by stacked plates of aluminum or steel, one face covered by a thin layer of selenium and by a softmetal counterelectrode. They could be damaged by excessive humidity or by corrosive atmosphere: however, in this case, the entire set should show severe trace of rust and corrosion.

how to replace a selenium rectifier with a diode YouTube

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Jan 05, 2016· sears silvertone console stereo repair part something. Choosing a Backup Generator Plus 3 LEGAL House Connection Options Transfer Switch and More …

Help replacing selenium rectifier on Scott 299 Technical ...

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Feb 03, 2012· I have been going through replaceing some of the caps on a broken down HH Scott I pick up a while back so far with just the rectifier tube in I got it to light up and the 2 led lights on the front to come on. Before I continue I would like to replace the selenium rectifier. I have read some were ...

My "new" Dynaco PAS2 preamp sounds horrible! | Steve ...

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Jun 23, 2007· My "new" Dynaco PAS2 preamp sounds horrible! Discussion in 'Audio Hardware' started by jpmboston, Jun 18, 2007. ... I can't help, but if it was mine I would be searching and asking questions here ... The selenium rectifier sits on top of a pair of 2000 mfd caps leading to the transformer. It's part of the heater supply as you mentioned.

Preventative Maintenance Brunswick Selenium Rectifier "A ...

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Preventative Maintenance Brunswick Selenium Rectifier "A's" 10082017, 08:48 AM With the help of James and exMech, I converted my old Jet Back rectifiers to a Silicon Bridge Rectifier.

BY RICH BONKOWSKI, W3HWJ …

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companies began to make commercial rectifiers by evaporating selenium onto small plates of steel or aluminum. These rectifiers were a real breakthrough in improving the efficiency of electronic equipREPLACINGSELENIUMRECTIFIERS Typical selenium rectifiers. BY RICH BONKOWSKI, W3HWJ 3568 SOUTHRIDGE DR., SANTA, ROSA, CA 95403

Antique Radio Forums • View topic Selenium Rectifier ...

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It's not impossible a "NOS" selenium rectifier would have failed the same way as the one already in the unit. Like paper and electrolytic capacitors, a selenium rectifier could deteriorate due to age alone. If you have a digital meter, there should be a function to check the diode.

Selenium recifier | QRZ Forums

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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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