I have had a set of eight of these for a few years now. I am very aware of where they go on the mask. However I do not remember what kind of vacume tube they are from. Or the history of the part. I have been going through a few tubs of grebies and found at least a few things that I forgot that I have:redface
Any help would be great
Last edited by Darth Stone; Aug 26, 2007 at 10:02 PM.
Those are from a photomultiplier tube. I believe they are some sort of diffuser plate and are stacked inside the tube. I am not aware what the exact tube is though. There are different styles of diffuser plates (very different from these) in these things, so be careful if you're going to start buying them. Also, there are varients in this shade style as well. You have what appears to be silverish 'blades' where the real prop had bronze colored 'blades'.
Hope this helps a little. And by the way, not to nitpick, but it's Vader Reveal......
They come in a variety of photomultiplier tubes. some of them have a circular backing to them and some of them have a square (depending on location in the tube).
here are a few tube types that have them:
THORN EMI 9956B
Centronic Photomultiplier: P4231RA
EMI, thats itI just knew I would remember if I just had some help
Thank you, and I have changed the spelling. Just had another blond moment.
These do have the round backer to them. And I do recall having two other sets that I let go because the vents were discollored by what I thought was heat. They were mostly brass collored in the center, and then silver arround the edges where the backer covered them.
These will go into a reveal helmet as soon as I can repair the mother molds, (just cracked plaster). But just how much in todays dollars should I expect to pay for another set or whole tube?
What are the known variations to watch out for?
What other model tubes have the correct parts?
I've been looking for some. I found a couple places online with many different EMI models in stock and the prices vary greatly.
It'd be nice if the cheaper models had the correct parts.
lonepigeon said:
the ones i got from Porty, were the square tabbbed ones. i didnt think any of them actually had the bronze colored louvers. i thought they painted them, that is what i did, i painted mine a copper/bronze on the louvers, and one set is already in my NG/Porty lid, and the second set is waiting for my new MR SE rots lid to arrive, so i can install them.
Man I hate getting old! I have been trying to find my notes on these for the last hour. And I know that there were at least 3 different models of the tube. And another note. Of the 3 tubes that I have had there are 9 of the vents in each one. There is right now on the Bay a Thorn EMI Gencom Fact 50 MK III Photomultiplier Housing with a current bid of USD 9.99. It looks intact although the internals could be anything. I may hold off until the last few minutes and do a sniper bid on it, but nothing to high.
Yes Ed, the ones from Porty are great for costumes. Not sure if they are a casting or just a repop of the item in question.
No the real ones are definitely copper colored louvers. That is exactly as they come out of the tube. Painting them that color is the next best thing as they will look identical if you have the right shaped louvers.
Dave
I just won a Thorn EMI Gencom Fact 50 MK III Photomultiplier Housing on the bay. Looking forward to seeing if I just waisted even more money
I saw that on ebay, but I thought that's just the housing (no tube inside).Darth Stone said:
I just won a Thorn EMI Gencom Fact 50 MK III Photomultiplier Housing on the bay. Looking forward to seeing if I just waisted even more money
Hope I'm wrong.
For some reason I thought they were photomultiplier with a number 71 (maybe an e-71?), and am about 90% sure it was a Thurn tube. My memory is not what it used to be, however, so I may have the number wrong. They are DEFINITELY not the ones Porty sells. I own his and they are a fine, cost effective, substitute but they are not the right ones.
The blades should be bronze (as I recall) and I think it had a ridge in the middle.
Last edited by bubba fett; Aug 30, 2007 at 10:07 PM.
lonepigeon said:
It is advertised as a untested device. There has to be somthing inside I'm thinking. No one has ever said that the tubes are in the power supply unit just in the photomultiplier itself. Allthough I didn't see any vents or cooling fan cage on the outside. Time will tell
Well, I just got the UPS tracking number for this. And the shipping weight is 16.0 LBS so there has to be something inside I hope
Just got home for lunch and I found this large box at my step. Got it inside and opened it up, tore the thing apart only to find a heat sink and a fan inside
Oh well, out to the trash it goes
If it's the dynodes you're interested in you might give a guy named Paul Davison a try (paulatelectrontubesdotcom). I found him several years ago during the search for the dynodes and so subsequently did alot of other folks so he's very familiar with the part in question (dynode mesh and frame). Electron Tubes is the company that produces the Thorn/EMI tubes so these are the exact-to-the-original dynodes. It's been a good while since I communicated with him so I'm not sure if he's still with the company but their corporate (UK) website is still www.electrontubes.com so on the chance you can no longer find Paul himself someone at the main site should be able to steer you in the right direction. I can't vouch for current prices though; it seems like they were selling for something like $20.00 each several years back ...
James
Edit: It seems Paul's name is still listed as a contact so there you go...
Last edited by jme3; Sep 10, 2007 at 4:37 PM.
Reply with Quote
