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 #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
The anode water cooling jet, is a slot, which coincides with the electron impact area on the anode surface, so the vacuum port was arranged, so that when the tube is fitted into the cabinet, the window facing my film, is one of the original spot focus windows. (The others will be blocked off with small lead discs.)
I ground a small mark on the cathode assembly, to align the filament correctly, for spot focus, out of that window.
The anodes in these tubes are in fact flat, which means, that if I need line focus for anything, I can just loosen up a clamp, and rotate a flange by 90 degrees, or in fact, any geometry in between! The only caveat being, the less efficient cooling of the hot spot (line) on the anode face, since it would be rotated 90 degrees with respect to the cooling jet.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 699
yes , me too, excellent initiative into restoring these old tubes, but what about trying to build your own design from complete scratch?
I can only guess that I'd have a lot of good time playing with various discharge tubes, filaments, and various metallic targets if I only had a good vacuum pump.
Registered Member #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
radhoo wrote ...
yes , me too, excellent initiative into restoring these old tubes, but what about trying to build your own design from complete scratch?
Already done that! Several designs in fact, including flash x-ray tubes, carbon fiber cathode tubes, special windowed tubes, etc, all built using standard flanges. I built a Lenard tube once too, it is somewhere in the project thread on here.
The point of this project, is to re-build the tube, to perform at the manufacturers specification, whilst being fully demountable, which turns out to be much more challenging than any of my other designs. Building x-ray tubes is easy, building it constrained by rules and limits, is hard! Most of the issues have now been addressed, however, since the tube will be run to its original spec, heat dissipation and management still needs solving, and I have yet to replace the cathode filament, which I'm sure will be very entertaining!
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.
Rebuilding an x-ray tube.
