Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
Read More
Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
Read More
By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
Read More
Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
Read More
Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
Read More
The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
Read More
Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
Read More
10 PLATES, 1 1/2" X 1 1/2", P/N C372D5EB1. 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 …
Details
International Rectifier Corporation's high-voltage, cartridge-type selenium rectifiers are obtainable with ratings up to 9.9 kilovolts r.m.s. input for single units. These single rectifiers may be employed in conventional and special voltage doubler, tripler, and quadrupler circuits, as well as in simple half-wave and full-wave circuits.
Details
Selenium rectifier. A selenium rectifier is a type of uncontrolled rectifier that uses a layer of selenium on a metallic backing as the rectifying element. Selenium rectifiers were commonly used in the early days of electronic power supplies, but have been largely replaced by more efficient and reliable rectifier technologies. Vacuum tube rectifier
Details
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.
Details
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 application. 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 is rather toxic.
Details
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 …
Details
After the wiring is corrected you can try measuring the output DC voltages. The filaments of the tubes on each board are in series, so if the tubes are removed, you will have to measure between the ends of each twisted pair where they are. soldered to the board. The DC voltage between the ends should be around 24VDC.
Details
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 ...
Details
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.
Details
The Project 34 is the kind of pedal that can't be quickly categorized. It can be used for a boost, pre-amp, a bit of a compression, or a light overdrive. But whatever you decide it is best at, it will always be flavored by the unique character of the selenium rectifier. You may hear characteristics more akin to a small tube amp, rather than ...
Details
A metal rectifier is an early type of semiconductor rectifier in which the semiconductor is copper oxide or selenium. They were used to convert alternating current to direct current. They were often used in devices such as radios and battery chargers. Westinghouse Electric was a major manufacturer of these rectifiers since the late 1920s.
Details
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. …
Details
Jul 31, 2016. #1. I have noticed in several posts, references to selenium rectifiers in these vintage generators. I think it prudent to inform people that these can be extremely dangerous. When these rectifiers fail they often produce poisonous gases, breathing these gases will kill you. When working on these gen sets we need to be careful.
Details
Subscriber. Mar 2, 2015. #1. Several months ago I bought a rough Dynaco ST70 off the bay. It appears someone did some previous "upgrades" with caps and SR. Yesterday I started my restoration (installing a new driver board, stereo/mono switch, rerun of solder joints etc.) and came across an odd (to me) thing in that the Selenium Rectifier had ...
Details
Actually, they ARE heat sinks. Selenium rectifiers were much less efficient than silicon, or even germanuim rectifiers, with a forward voltage drop of about 1V per cell (plate). That means that if your rectifier has 16 cells, then the rectifier, as a whole, will have AT LEAST 16 volts of forward voltage drop.
Details
The selenium rectifier but was now especially for low-voltage a much more effective rectifier available, as it was the used until around 1930 cuprous oxide rectifier. Cuprous oxide rectifier, however, were still manufactured as a measuring rectifier due to their low forward voltage up to about 1950. Construction
Details
Look at the drawing of the rectifier in your service manual/parts catalog section. It is a sil. based, 4 diode, 25 w. rectifier, in one package. It should have been mounted to the WSR metal tightly, using a good heat-sink grease. It also, in my humble opinion, MUST be fused on the AC side with a max. of 1/2 amp fuse.
Details
Selenium rectifiers on little Hondas generally work fine for their intended purpose, but they have a few inherent problems. They are somewhat exposed, and corrosion will sometimes ruin them. They heat up in use and sometimes the heat will eventually do them in. And, they are old technology.
Details
The positive connection from the selenium rectifier is connected to one side of the 125 V power transformer output and the negative side of the rectifier is connected to a voltage divider and onto the rest of the circuit. The other side of the transformer connects to ground. I measure 113 volts at the output of the selenium rectifier connected ...
Details
___ 12 The selenium rectifier is replaced with bridge rectifier ___ 13 Replaced power filter caps ___ 14 Replaced AGC time constant caps ___ 15 Langford AGC diode modifications ___ 16 Other SSB modifications ___ 17 A Line filter …
Details
Armed with a 1n4004 and a suitable high voltage electrolytic capacitor, I proceeded to replace both the selenium rectifier and the filter cap that followed it (on principle — the existing cap was cosmetically in OK condition, but old electrolytics often don't work well, and sometimes fail catastrophically) to bring the 88 V B+ line and -40 V bias voltage back into …
Details
Aug 31, 2019. #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. The transformer AC secondary is ...
Details
The first of many receiver plans to be published by the magazine was a four tube (or three tubes, plus selenium rectifier) AC-DC broadcast set shown here. The first issue also carried a few theoretical articles, as well as the plans for one transmitter. The magazine continued until September 1981, when the final issue was published.
DetailsRe: Replacing ST70 Selenium Rectifier. by Bob Latino Mon Dec 08, 2014 5:05 pm. The red/black bias wire (the transformers AC bias line) connects to the + side on the selenium rectifier because you are trying to create (on the opposite side of the diode) a NEGATIVE DC voltage. The bias system on Dynaco tube amps runs a negative DC …
Details
One is the lowest value (least reliability), and four is the highest value (most reliability). L: Inductance value of an electrical component (e.g., a coil or winding), or of a circuit. Units are Henries. Loop circuit: The armature connections (two leads) between the DC hoist motor and its DC power source.
Details
Selenium rectifiers arrived in the 1930s and were largely replaced by silicon technology by the late 60s to early 70s. They have greater resistance to current flow than silicon rectifiers do and about 1 V of generated voltage is lost in them. They not only wear out with use (higher resistance) but they have a shelf life of a few decades.
Details
For more information on the Selenium Rectifiers range please click here. For further information on our selenium rectifiers please call us on 01444 243 452 or email [email protected]. We offer a wide range of custom designed selenium rectifiers and we can replicate obsolete Westcode, International Rectifier and Semikron selenium …
Details
Selenium Rectifiers. Below you can see a miscellany of seven types of rectifier, half-wave, full wave and bridge. In the centre are five RM4; below these are three RM3 and two RM1A half wave rectifiers. Along the top is a small bridge rectifier, a 280/LU1093 or AP53170 together with a larger bridge, the "5307".
DetailsAs 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). So you can replace the rectifier with two diodes with the anode end …
Details
A rectifier is an electrical device that converts alternating current (AC) into direct current (DC). The process of converting AC to DC is called rectification. In this article, we explore the workings of rectifiers, including types such as half-wave, full-wave, bridge rectifiers, and special rectifiers like Mercury Arc and Selenium Rectifiers.
DetailsBasically, a rectifier is 4 diodes. A diode will only pass current in one direction, so when you flop the leads you check one of the 4 diodes. A diode that reads 0 in both directions is shorted (but you would already know that from the HV fuse going poof) A diode that reads infinity in both directions is open.
Details
A1BPT - Full Wave Selenium Rectifier. Mfg: International Rectifier. A1BPT. IR # A1BPT. Full Wave 25 Volt RMS 180mA; TO75U - 1/2 Wave Selenium Rectifier. Mfg: International Rectifier. TO75U. IR # TO75U. 1/2 Wave 130 Volt-RMS 75mA! Mobile mode. To create online store ShopFactory eCommerce software was used.
Detailsby 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 ...
Details
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 …
Details
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 ...
Details
Sofol is a well-known crusher and grinding mill manufacturer that offers equipment and solutions for customers from aggregates, mining and mineral grinding industry.
You can leave your message here, we'll send you an Email immediately.
Online ChatCopyright ©2000- 2024 Shanghai Sofol CompanySitemap
PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
GET QUOTE