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Author
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Topic: Simplex XL aperture instability
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Frank Angel
Film God
![](http://www.film-tech.com/ubbmembers/248b.jpg)
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 03-21-2006 09:48 AM
Someone once mentioned to me that he didn't think that using the water pump aparratus on Simplexes was worth the trouble. He said they hardly do any significant amount of cooling and with a carbon arc burning only 80amps, the said I really didn't need water cooled. But DAMN it is so cool (no pun inteneded). I only have 40ft wide screen, so I get decent light even on 1.85. BTW, we had the Joe and Shirley Wershbas in for a screening of GOOD NIGHT AND GOOD LUCK (the are portrayed in the film and they were Brooklyn College alumni). Warner Bros, bless their hearts, sent us a high-silver content EK print. Is it my imagination, but does B&W just sizzle off the screen....it was soooo sharp and full of incredible detail. With my spanking new ISCO's, I really thought I was looking at 70mm. DAMN 35mm can look good!
Anyway, one of the pumps crapped out just the day before and I got really worried. I wasn't about to be the one to damage a show print; what with black and white and high silver and all, I thought this could really be a disaster -- I was prepaired to go to Grangers and buy a submersible pond pump, which is what is in there anyway. But before panic set in, decided to take a leader that had lots of full black frames and loop it -- ran it for about 10 turns. No damage at all, not even a hint of embossing, so I figured I was safe. So, should I retain all that water cooled business or just install air cooled blocks? I mean, 80amps carbon arc is like 3600w....I am not sure how eqivalent carbon arc light energy translates in terms of wattage to xenon light energy, but my understanding is that you don't need to go to water cooled gates with xenon until up around 4000w - 4500w bulbs. If a B&W print is not burned by this lamphouse, then there is no question I am perfectly safe with color, right?
But if I go with air cooled, then I will miss all those ooohs and ahhhs when the professors bring film majors up to see the booth and I show them the big tubs of water and circulating tubes. I guess I will just have to make sure when I stike the arc, I hold the rods close a few seconds longer than usual to make them spit and hiss, then pull them apart and quickly open the lamphouse door so they can see the red-hot tips and the residual flame. That gets them pretty good too.
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