Selenium rectifiers (Barry L. Ornitz) yarchive

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.

Selenium Rectifier Replacement? Blogger

Aug 31, 2005 · OK, this is a selenium rectifier from GE. It was OEM for the Seeburg. It''s that gray device in the middle of the picture on the right. Most people state you should replace these items with modern equivalents.

Selenium rectifiers (Barry L. Ornitz) yarchive

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.

Conversion of Selenium Rectifier to Silicon Diode(s) EM

It too is a big honker. I suppose the 8VAC is OK if it is just a 1/2 wave rectifier. I want to replaced the Selenium Rectifier with a diode. Do you think 6 amps of diode will do the job? I will need a power resistor in series to drop the voltage to the specified 16VDC because of the higher efficiency of the diode vs the selenium rectifier.

Selenium rectifiers: how to preserve them? Radiomuseum

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.

GE 806 selenium rectifier replacement help needed

I replaced the selenium rectifiers with 1N4007 diodes and 68 ohm 10 Watt resistors in series, but when I turned the set on the resistors started smoking.

Help, please, with a selenium rectifier replacement question

Oct 22, 2010 · Subject: Re: Help, please, with a selenium rectifier replacement question Fri Oct 22, 2010 12:29 am: From time to time a selenium rectifier will break down and spew toxic selenium. Thus, not only will the circuit fail you will have a toxic chemical cleanup task. Replace the rectifier. A 1amp, 800 1000 PIV diode will work fine.

Selenium rectifier question Electronics Forums

Apr 16, 2008 · selenium rectifiers are not involved in the 600 volt supply. CR2 A&B generate the 12.6 volt filament voltage and can be adjusted with R1. No problem there. The other selenium rectifier CR1 is to generate a negative bias supply.which is also adjustable and further clamped by Zener CR3. The high voltage is rectified by CR4 and CR5 which, I assume are

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. 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

HELP with Selenium Rectifier Replacement Wurlitzer 1700

HELP with Selenium Rectifier Replacement Wurlitzer 1700 (too old to reply) Fred 20040602 22:20:26 UTC. selenium rectifiers with modern silicon rectifiers, that would be helpful too. the selenium rectifier is used to provide power to the record changer (carousel) drive motor it''s mounted on the amp chassis simply as a

FDP Forum

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.

Help replacing selenium rectifier on Scott 299 Technical

Feb 03, 2012 · here''s a couple pics that may help. Notice the silicon rectifier is mounted right on top of the old selenium. Notice also there are no wires connected to the old selenium rectifier

Fundamentals of Rectifier Operation, Monitoring, and

Feb 29, 2016 · Fundamentals of Rectifier Operation, Monitoring, and Maintenance Cathodic protection (CP) is an important component for the sustainability of many metal structures. The most common impressed current voltage sources are rectifiers, which can break down.

Replacing capacitors in an old Telefunken radio Page 2

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.

Replacing capacitors in an old Telefunken radio All

Feb 10, 2015 · use your nose, selenjium rectifiers usually have a rotten egg smell when they go bad. there is a problem with replacing selenium rectifiers, they have a higher voltage drop than silicon diodes, and may make the rectifiers fail. the added resistor will only drop the voltage after the tubes warm up the selenium diodes pictured above are not for power supply use, the long thin ones are for

Selenium rectifiers: how to preserve them? Radiomuseum

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.

RECTIFIER SELECTION, OPERATION &MAINTENANCE

rectifier downtime will occur due to unplanned failure of the equipment. A good maintenance program will help ward off some component failures, and basic troubleshooting skills will bring the rectifier

GE 806 selenium rectifier replacement help needed

I replaced the selenium rectifiers with 1N4007 diodes and 68 ohm 10 Watt resistors in series, but when I turned the set on the resistors started smoking.

My "new" Dynaco PAS2 preamp sounds horrible! Steve

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.

Selenium Rectifier Harris Eduional is Reinventing Science

Oct 29, 2009 · Posts about Selenium Rectifier written by reinventingscience. The physical interface between the selenium oxide and the other metal forms a kind of semiconductor junction due to the different electron affinity of the two dissimilar metals.

Selenium rectifier question Electronics Forums

Apr 16, 2008 · selenium rectifiers are not involved in the 600 volt supply. CR2 A&B generate the 12.6 volt filament voltage and can be adjusted with R1. No problem there. The other selenium rectifier CR1 is to generate a negative bias supply.which is also adjustable and further clamped by Zener CR3. The high voltage is rectified by CR4 and CR5 which, I assume are

GENCO Owners Club All clubs (members only!) Pinside

Selenium rectifiers are notorious for failing gradually over time, and then dying suddenly. It is not a matter of "if" a selenium rectifier will fail, but rather "when" it will fail. Selenium rectifiers fail because they develop high, internal series resistance, resulting in lower bias or "Csupply" voltage.

Selenium and Silicon Rectifiers

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

Two Wire Selenium Rectifier Replacement lilHonda

Aug 10, 2013 · I was out and about and bought one of those resistors. Can I still use it, even if not "the" recommended piece? I looked at the wiring diagram and the selenium rectifier has one lead coming in from the AC generator (alternator), and the other lead going to

Selenium (Se) Chemical properties, Health and

Selenium. Selenium is a non metallic chemical element, member of the group XVI of the periodic table. In chemical activity and physical properties it resembles sulfur and tellurium.Selenium appearsin a number of allotropic forms: the most popular are a red amorphous powder, a red crystalline material, and a gray crystalline metallike form called metallic selenium.

power electronics Is this a selenium rectifier

This device probably used a selenium rectifier because silicon rectifiers did not exist at the time it was constructed, or were not large enough to use in this appliion. If a similar device were to be built today, it would use a silicon diode there is no advantage to the use of a selenium rectifier. Selenium

Selenium recifier QRZ Forums

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.

Selenium rectifiers: how to preserve them? Radiomuseum

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.

Changing selenium rectifier to silicon diode

selenium rectifier and through a 15 ohm, 5 watt W.W. resistor. After replacing the selenium rectifier with the silicon diode, what value resistor do I need to replace the 15 ohm resistor to maintain the correct voltage? Email O.K.

Replacing capacitors in an old Telefunken radio Page 2

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.

Selenium recifier QRZ Forums

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.

Selenium and Silicon Rectifiers

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

Old Time Selenium Rectifiers Can 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.

SeleniumRectifier

John Fogerty sings "Deja Vu All Over Again," live, acoustic version, 2008. Personal insults and/or foul language tend to make these discussions fall apart, so I will need to delete any such po

SeleniumRectifier

John Fogerty sings "Deja Vu All Over Again," live, acoustic version, 2008. Personal insults and/or foul language tend to make these discussions fall apart, so I will need to delete any such po

Antique Radio Forums • View topic Selenium Rectifier Testing

A selenium rectifier is made up of several diodes. Each plate is one diode which are in series. A diode has a specific voltage drop. All, usually 6 in series, add up to 7 volt drop on a good selenium rectifier. Meters use a 1 1/2 volt battery on ohm scale. This isn''t enough to overcome the selenium rectifier drop.

Cougar Electronics Corp. Selenium Rectifiers & Surge

Selenium Rectifiers & Surge Suppressors. Do not give up, thinking these components are impossible to find. We are here to help ! selenium rectifier. Rectifier 3 phases. Surge Suppressor. Troubleshooting a selenium rectifier or suppressor. Our customer service will be happy to help you to determine what''s the best solution.

Metal rectifier Wikipedia

A number of rectifier discs would need to be used in series to provide an adequate reverse breakdown voltage figure a bridge rectifier for a 12V battery charger would often use 12 metal rectifiers. Selenium rectifiers were generally more efficient than metaloxide types, and could handle higher voltages.

Metal rectifier Wikipedia

A number of rectifier discs would need to be used in series to provide an adequate reverse breakdown voltage figure a bridge rectifier for a 12V battery charger would often use 12 metal rectifiers. Selenium rectifiers were generally more efficient than metaloxide types, and could handle higher voltages.

Antique Radio Forums • View topic Selenium Rectifier Testing

A selenium rectifier is made up of several diodes. Each plate is one diode which are in series. A diode has a specific voltage drop. All, usually 6 in series, add up to 7 volt drop on a good selenium rectifier. Meters use a 1 1/2 volt battery on ohm scale. This isn''t enough to overcome the selenium rectifier drop.

Antique Radio Forums • View topic Selenium Rectifier Testing

A selenium rectifier is made up of several diodes. Each plate is one diode which are in series. A diode has a specific voltage drop. All, usually 6 in series, add up to 7 volt drop on a good selenium rectifier. Meters use a 1 1/2 volt battery on ohm scale. This isn''t enough to overcome the selenium rectifier drop.

help refresh my memory, selenium rectifier replacement?

Jun 07, 2010 · Help Hello Guest, Please feel free to join us! There are many more parts of the Phorum that only members can see. Learn about all of the benefits of being a member. Login or Register. Login Register. The PHILCO Phorum / Various and Sundry Categories / Other Radios (NonPhilco)

Selenium rectifier question Electronics Forums

Apr 16, 2008 · selenium rectifiers are not involved in the 600 volt supply. CR2 A&B generate the 12.6 volt filament voltage and can be adjusted with R1. No problem there. The other selenium rectifier CR1 is to generate a negative bias supply.which is also adjustable and further clamped by Zener CR3. The high voltage is rectified by CR4 and CR5 which, I assume are

Selenium Rectifier Radiomuseum

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.

Selenium rectifier Wikipedia

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 appliions until they were superseded by silicon diode rectifiers in the late 1960s.

Selenium Rectifier Handbook (Sarkes Tarzian Company

Identifier Selenium_Rectifier_Handbook_SarkesTarzian_Company Identifierark ark:/13960/t6644zw7t Ocr ABBYY FineReader 11.0 Pages 45 Ppi

Preventative Maintenance Brunswick Selenium Rectifier "A

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.