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 ...

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 …

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.

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.

The selenium rectifier replaced the vacuum tube rectifier in the period 1950 onward and was in use until the 70's. Selenium rectifiers are recognizable by the cooling fins, which are often painted green or …

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 …

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 ...

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. …

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 …

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 ...

A concise explanation of the construction and theory of operation of the selenium rectifier is combined with a comprehensive discussion of the effects of various applications on design by the author. Published in: Electrical Engineering ( Volume: 63, Issue: 12, December 1944 )

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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.

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.

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 …

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 …

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

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.

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 ...

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 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).

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 …

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.

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.

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 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 ...

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

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.

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 ...