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.

The basic selenium rectifying junction will be termed an element and any group of them will be termed as assembly or rectifier assembly. The element is shown schematically in Fig. I where a base plate provides mechanical support and rigidity for the selenium material, and further functions

Testing a selenium rectifier out of circuit will be an exercise in futility. They don't test well as does a silicon diode. As mentioned above, the voltage output (provided …

crutschow. Joined Mar 14, 2008. 34,392. Sep 6, 2023. #4. ericgibbs said: A point to note when replacing Selenium rectifiers with Silicon, is the high forward voltage drop of Selenium compared to Silicon. This will result in a much higher DC supply voltage to the circuits. Yes.

Current creep in an unformed selenium rectifier with 20 V reverse voltage applied. Voltage is switched off for 1-sec intervals in the negative-creep region. forming, almost certainly due to the formation of cadmium selenide between the counter-electrode and the selenium. To explain the reduction in reverse current during forming, he suggests ...

The owner of the bike had replaced the selenium rectifier with a modern three-phase silicon diode array, a much smaller and probably more efficient device. Was the selenium rectifier still good? We …

Yes, with standard wiring, this machine had a selenium rectifier and no voltage regulator, Instead, one of the alternator wires went via the lighting switch so that it only connected to the rectifier when the lights were on. ... (with key) goes to the headlamp rotary switch, and when switched 'on' the DC+ is supplied to tail lamp and headlamp ...

A selenium diode is a semiconductor rectifier composed of a selenium layer between two metal electrodes, used historically in electronics. Selenium Diode: A Comprehensive Guide Introduction to Selenium Diodes. Selenium diodes, a type of semiconductor diode, have been utilized in various electronic applications for several …

What often people ignore is that, according to Keith Henney, also selenium rectifiers show an increase of the reverse current when no AC power is applied for a long while. And also this leakage current rapidly decreases when the voltage is gradually increased to its operating value. The trick to safely operate old sets, leaving most of their ...

Good to know the old Selenium Rectifier drain batteries. That fits with experience, and I can swap the Silicon Rectifier from my 1978 CT90 and hopefully that will resolve the problem. I will need to buy a second rectifier, but for now I can only ride one bike at a time. The blowing neutral gauge bulb is more perplexing.

The two transformer leads that currently supply the selenium rectifier get moved to two holes on the SDS board (indicated as "filament winding") which correspond directly with the two AC connections on the new silicon rectifier bridge. ... switched. I don't want to deviate from that, the old "plug it in the other way and it's quieter" routine ...

I want to hear this in an unmodified form. So I have the parts to replace the choke, the multi section can, all the capacitors on the board, bias circuit caps and the selenium rectifier. And some diodes to protect the rectifier tube as I will be removing the SS rectifier mods. For tubes I have a new set of EL34-EH and a complete set of …

The current load on that is likely very low, so the voltage drop is probably not that significant on the selenium rectifier. Its possible that you don't really need a dropping resistor. ... Some sound alive, some sound dead when power is switched on. I never investigated the issue until now. I have a funny feeling the speaker might sound dead ...

12y 61,650 1,474. I have this big honker of the selenium rectifier that is eating up 3VDC and passing 8VAC. The output is supposed to be 16VDC but is measuring 13VDC. For some reason I am confused with the arrangement as depicted in the schematic which does match the actual equipment. The rectifier is at the Red 1.

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. …

Incorporates a 8amp relay that controls the rear switched AC outlets, eliminates stress on the main power switch. ... Easy installation to the chassis stud, that supported the old selenium rectifier & 12VDC filter caps; Over 50 boards have sold, with no returns or issues that could not be resolved. I sell the complete stuffed board for $125.00.

We would like to show you a description here but the site won't allow us.

Surprisingly, it actually worked as-is, but there was major trouble. One problem area was that the 7591's ran HOT. I mean, so hot, I could turn the heat in the lab off (well, not really, but you get the idea). Not good. Some of this problem was the fault of the selenium rectifier (of which I had never seen the little Siemens flat-pack before.

Rectifier Stack. a semiconductor instrument made up of an assembly of sequentially connected rectifier semiconductor diodes. Several rectifier stacks contained within a single housing make up a rectifier unit, which may be switched into electrical circuits according to various schemes. Rectifier stacks and units are utilized in various radio ...

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.

Selenium rectifiers: failures and restoring tips. 04.Jun.20 21:24. Too often, when powering an old radio or an electronic set using selenium rectifiers, these components fail. Symptoms are a quite fast overheating of the …

PIV Peak Inverse Voltage Forward Voltage Drop. exceed PIV = permanent damage restriction in selenium "valve" scrubs off about 1.2 to 1.7 Volts on the way throughand …

The meaning of SELENIUM RECTIFIER is a rectifier employing the asymmetrical conductivity characteristic of selenium.

The Y-600 did not work at all. After replacement of non-functioning tubes, it started working fine from my home made 90V battery. However, when I connected the Y-600 to the mains there was a nasty hot smell-Selenium Rectifier I thought! Inded the rectifier was faulty. I replaced it with a modern Silicon diode, rated at 1A and 1000V.

JohnLillig. Usually a selenium rectifier drops a volt or 1.5 or so per plate, or 5 to 10 volts usually in a stacked rectifier. On tubes, sometimes the extra bias voltage is not a bad thing, but yeah you would need to use Ohm's Law and figure out the specs of the resistor to use for correct or spec voltage.

Selenium Rectifier replacement. FULL WAVE BRIDGE RECTIFIER. 400V 8AMP. Radio Shack part # 276-1181 ... I plan to move/adjust whatever needs be to keep everything "hot" off the mains switched, fused and inrush limited, if that makes sense. Again, thank you Larry, you've helped me VERY much. I am grateful you were gracious …

by Bob Latino Mon Jan 19, 2009 3:46 pm. The best thing to do is to remove the selenium rectifier and replace it with a UF007 diode. What you do is take out the selenium rectifier and replace it with a two lug terminal strip. Run the RED/BLACK wire to one lug on the terminal strip. Run the wire from lug 4 of the 7 lug terminal strip to the OTHER ...

Disassemble selenium rectifier and clean all connections just in case. Perform voltage drop on positive and ground wires to the battery. Resolution. The problem is not resolved. We have 6.3 volts 0.1 to 0.9 amp at the battery running and 5.91 volts and falling with -2.1 amp with the headlight on.

The forward direction in the selenium is from alloy to baseplate. Thus, the alloy is comparable to the cathode and the baseplate to the plate of a vacuum-tube rectifier. This photo shows a large 5-amp. selenium rectifier compared in size with a 500-ma. unit (left), a 50-ma. unit (center), and a common matchbox cover (right).

Abstract: 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-sulphide rectifier. In the early 20's, the copper-oxide type came into common use, and during the past three years, selenium rectifiers have found wide application in American industry.

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 half …

Well-maintained rectifiers can provide uninterrupted CP, which reduces repair costs and labor/technician time. This article discusses the fundamentals of rectifier operation and maintenance along with …

Jan 23, 2012. #1. I have 3 orange (selenium based) rectifiers, my meter says they are all bad in different ways, one open both directions, one 130k both ways and one 56 Ohms, one way, but it breaks down with the small voltage from my Fluke 77 the other direction.

SELENIUM POWER RECTIFIERS. 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. …

I suspect selenium rectifiers were chosen for cost and availability, not to "sound like" tubes. FWIW the subjective consensus nowadays seems to favor fast …

Selenium rectifiers are dry-plate rectifiers of the electronic type. The history of dry rectifiers hegan some 30 years ago with the advent of the copper-sulphide rectifier. In the early 20' s, the copper-oxide type came into common use, and during the past three years, selenium rectifiers have found wide application in American industry. Fundamentally, this third and …

Some of these advantages include: Low reverse leakage current: Selenium diodes have a low reverse leakage current, which means they can effectively block the …