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ericantonio
31-Aug-2017, 09:56
Got them from a guy cleaning out his dad's darkroom

Doesn't seem to have a lot of threading to it. And a piece of paper on one of them saying that it needs to be well ventilated so probably gives off a lot of heat.


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Michael Graves
31-Aug-2017, 09:59
I used to have an old slide projector that used a bulb that looked exactly like that. Don't remember make and model, though.

Jac@stafford.net
31-Aug-2017, 10:11
Definitely a projection lamp. There was originally some identifying printing on the very top, in grey type in the black area. It might have worn off.

ericantonio
31-Aug-2017, 10:25
Definitely a projection lamp. There was originally some identifying printing on the very top, in grey type in the black area. It might have worn off.

I took a pic of the top, looked really faint, but I couldn't get anything. He also had a ton of old movie canisters from his neighbor who worked in Hollywood. They look like 14" Octogonial wheels. So maybe it was for a movie projector?

xkaes
31-Aug-2017, 10:40
Yup, projector bulb. The designation on the top, such as DAT or DAK, might be hard to read, but that's the key. Look at it carefully. Without that, good luck -- that are a million bulbs that look like that. You could spend a lifetime searching images on the web or you could find a lighting/bulb/camera shop in your town that might help.

LabRat
31-Aug-2017, 14:11
Some old colorheads use the tubular bulbs (with reflectors internally, etc) before the quartz reflector bulbs were used, esp very high output (750-1000W) units...

My old Agfa colorhead (on my Leitz IIc) uses these...

Steve K

Jac@stafford.net
31-Aug-2017, 14:28
My old Agfa colorhead (on my Leitz IIc) uses these...

Steve K

Wow! That's a seriously hot light source! Of my two enlargers is one LF and a Leitz IIa. I'm thinking of converting a Leitz cooling bonnet to fit it the IIa.

How in the world does the IIIc cope with the heat from that bulb, and is there a warm-up to steady time. Maybe you use a shutter in the system?

Seriously interested. Thanks for any help!
Jac

LabRat
31-Aug-2017, 15:27
Wow! That's a seriously hot light source! Of my two enlargers is one LF and a Leitz IIa. I'm thinking of converting a Leitz cooling bonnet to fit it the IIa.

How in the world does the IIIc cope with the heat from that bulb, and is there a warm-up to steady time. Maybe you use a shutter in the system?

Seriously interested. Thanks for any help!
Jac

Well Jac, I'm not sure!!! No shutter, just the projector bulb ramp-up time, runs not too hot to the touch, and WAY too much light output for type C color printing...

I found the head on auction, that still had stickers for the Australian Air Force and arrived with some tiny spiders inside from another continent... :-0

I think it had a 1000W bulb in it, and the sidewall construction was 3 internal chambers of thin steel, where the 2 outer layers had a straight through bottom to top path for convection cooling (but no fan)... My other Leitz Ic has an added 300W color head to it, with plenty of light, so this much output was WAY overkill, so I haven't used it yet...
I guess that this thing just sits on the highest part of the enlarger, and the heat just rises like some old, hot slide projector that has no cooling fan... And it dosen't heat the enlarger chassis/stage...

But Jac, you are welcome to PM me or post ??? about the many upgrades (including cooling) to the different Leitz models... Adding a small 6X6 format colorhead where the top half of the IIa lamphouse sits is a major upgrade!!! (Details later...)

Steve K

Sal Santamaura
31-Aug-2017, 15:49
Most likely a movie projector bulb. It's not readily accessible right now, so I can't dig out my late father's 8mm DeJur projector, but know that it used a bulb of that general configuration. It was 750W. I'm not sure the base was exactly the same, though.

On those occasions when a film broke and the currently projected frame stayed in the gate for longer than its usual fraction of a second, it was entertaining to watch on screen as a hole developed in the center and slowly melted outward. Until one could reach the "Lamp" on/off switch and let just the fan keep running to cool things down. Then it was time to get out the splicer and put things back together -- minus a small "jump" that would be evident in subsequent screenings. :)

Jac@stafford.net
31-Aug-2017, 15:51
[...] But Jac, you are welcome to PM me or post ??? about the many upgrades (including cooling) to the different Leitz models... Adding a small 6X6 format colorhead where the top half of the IIa lamphouse sits is a major upgrade!!! (Details later...)

Steve K

Steve, have we discussed this before? I have a special cooling bonnet for a Valoy which allowed me to use a 250W bulb, which is insane.

Sal Santamaura
31-Aug-2017, 16:25
...I can't dig out my late father's 8mm DeJur projector, but know that it used a bulb of that general configuration. It was 750W. I'm not sure the base was exactly the same, though...This is same model projector


http://www.ebay.ca/itm/Dejur-8mm-Film-Projector-Model-750-Vintage-/222626314152?hash=item33d58ff7a8:g:KUMAAOSwbopZSw3B

and this is the bulb


https://www.replacementlightbulbs.com/lampddb.html

Bob Salomon
31-Aug-2017, 16:26
Most likely a movie projector bulb. It's not readily accessible right now, so I can't dig out my late father's 8mm DeJur projector, but know that it used a bulb of that general configuration. It was 750W. I'm not sure the base was exactly the same, though.

On those occasions when a film broke and the currently projected frame stayed in the gate for longer than its usual fraction of a second, it was entertaining to watch on screen as a hole developed in the center and slowly melted outward. Until one could reach the bulb "off" switch and let the fan keep running to cool things down. Then it was time to get out the splicer and put things back together -- minus a small "jump" that would be evident in subsequent screenings. :)

Maybe 500w or less but not 750w.

ericantonio
31-Aug-2017, 16:30
This is same model projector


http://www.ebay.ca/itm/Dejur-8mm-Film-Projector-Model-750-Vintage-/222626314152?hash=item33d58ff7a8:g:KUMAAOSwbopZSw3B

and this is the bulb


https://www.replacementlightbulbs.com/lampddb.html

Dang 750W!!!

ericantonio
31-Aug-2017, 16:32
This is same model projector


http://www.ebay.ca/itm/Dejur-8mm-Film-Projector-Model-750-Vintage-/222626314152?hash=item33d58ff7a8:g:KUMAAOSwbopZSw3B



You see how there's a top reel and a bottom reel to this? Guy gave me a box full of stuff and one of them looks like 2 reels in an enclosure that you snap into that. Kinda cool.

Now to find someone out here that needs it! I don't want it, I want to give this stuff away.

Jac@stafford.net
31-Aug-2017, 18:26
I guess that this thing just sits on the highest part of the enlarger, and the heat just rises like some old, hot slide projector that has no cooling fan... And it dosen't heat the enlarger chassis/stage...

But Jac, you are welcome to PM me or post ??? about the many upgrades (including cooling) to the different Leitz models... Adding a small 6X6 format colorhead where the top half of the IIa lamphouse sits is a major upgrade!!! (Details later...)

Steve K

Steve, we need some help from another member who found the subtle differences between the cooling hood/bonnet and what-fits-what. So sorry that I purged my mailbox. Mine fits a Valoy, but not a II* series enlarger. Bummer! I love the IIa. I'm sure I would like a IIc.

LabRat
31-Aug-2017, 21:21
Steve, we need some help from another member who found the subtle differences between the cooling hood/bonnet and what-fits-what. So sorry that I purged my mailbox. Mine fits a Valoy, but not a II* series enlarger. Bummer! I love the IIa. I'm sure I would like a IIc.

I have collected a large # of Leitz enlargers + accessories (in a period of personal weakness) early last decade, (esp when the auction site started up in Europe, and used parts could finally be had) and I did get an example of most of the enlargers they made... I was putting together a IIa, when I was offered a IIc frame, and managed to do a VERY nice restoration on it... I like that each of these had a slightly different "look" for different printing applications (I like the IIa for printing very old rollfilm negs, as it has a slightly softer contrast "old skool" look that matches these, but the IIc for post 60's negs... I probably should sell one of these, but it would be a tough decision!!! Though I think 35mm is best served with a Valoy II, Ic, or V35 for color, where these make a bigger difference...

All of my enlargers & stuff are still in storage from my move, but when I get settled (hopefully in an industral space), I can pull out parts and measure whatever you need, and I have MANY upgrades that can be added... (I think of Leitz enlarger frames a lot like basic Formula 1 race car chassis' that can be re-configured different ways for different applications, and not too hard to make/replace parts for...)

It's very hot here, but maybe overnight, I'll go down to the lounge for a kool drink and start a post about Leitz enlargers (and stop hi-jacking this thread), so think of any questions you might have, and a wish list of what you might like your enlarger to possibly do or do better... :-)

These enlargers are the best reason not to trash or sell your smaller format film gear!!!

'Till later...

Steve K

Sal Santamaura
1-Sep-2017, 08:48
Maybe 500w or less but not 750w.Yup, 750W:


https://www.replacementlightbulbs.com/lampddb.html

online
9-Oct-2017, 03:10
There was originally some identifying printing on the very top, in grey type in the black area.