If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
It looks like there is a tiny little bare metal stump near that cathode wire. You can perform a mulitimeter test on that stump to see if it will behave like an SCR (testing via gate charging using the ohmeter function). If that doesnt work, or that stump isnt connected to anything, then I would belive it to be just a stud diode.
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
Nah wrote ...
I can't belive that nobody has said this.
I myself think it is a modern selenium rectifier. Test the voltage drop, it should be a lot more than a SI diode.
I'm guessing around 100miliamp, 210 volts
If I'm missing something, feel free to make me look like an idiot.
Modern selenium rectifier???? Is there really such a thing? I thought selenium rectifiers went out of vogue some time in the 1950's when the silicon diode became ubiquitous,
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
My bet would be a normal diode or SCR, long before selenium rectifier, besides could a normal modern diode replace a older selenium? Would the circuit even notice?
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
Patrick wrote ...
.....besides could a normal modern diode replace a older selenium? Would the circuit even notice?
Absolutely! I've replaced Seleniums years ago in old radios and TV's. Seleniums have a higher voltaqe drop than silicons, so you might want to place a low value resistor of a few ohms in series with the replacement diode in order to reduce inrush current. Other than that, there should be no problem.
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
Nah wrote ...
Some equipment that are still in use use S. rectifiers, so they have them made. It's that or spending 1,000,000 to buy a new one.
I agree.
I live in Canada, alberta, and where I work I got to see the insides of some of the electric trains (600VDC powered). They indeed still use selenium rectifiers, (from the looks of it there were "taps" of sorts with leads dissapearing into the train). these where large 3" X 3" X 6" and thier fins where colored blue. they had the markings and connections which indicated a rectifier. Hell, I even saw a mercury arc rectifier once on those triains. but these are the very old and decomisioned ones, however some of them where working in a park as an attraction. If you ever get the chance to see a mercury arc in person, it is something else and quite amazing to watch while its working, looks like some type of alien equipment.
the very new line of these trains (made by siemens) uses modern equipment however, and I didnt see any seleniums in there, just SCRs and diodes.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Help Identifing a Part
