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Author Topic: Building a projector Kenneth Wuepper Phenomenal Film Handler Posts: 1026 From: Saginaw, MI, USA Registered: Feb 2002 posted 11-04-2002 06:21 AM                     Exciter Supply At the Twilight Drive In we had a battery charger which was pretty well filtered. It was located in the generator room. It worked to keep the "jumper battery" charged and could be switched into the booth for emergency exciter use. The jumper battery was in a box so we could get cars started after the show. KEN  |  IP: Logged Adam Fraser Master Film Handler Posts: 499 From: Houghton Lake, MI, USA Registered: Dec 2001 posted 11-04-2002 09:10 AM                        How important is it that the current is exact? Reading the manual tells me that the bulb either a 9v 4a or a 10v 7.5a, I'll have to check next time I look at them which bulbs I have.  |  IP: Logged Bob Koch Expert Film Handler Posts: 183 From: williams ca Registered: Nov 2001 posted 11-05-2002 01:01 PM                     The Sh 100 was always supplied with a 9v 4 amp exciter lamp to be powered by their miserable PU 1000 with 2 side contact tungar bulbs and a ballast tube which was too slow to do the regulation it was supposed to. The 10 volt 7.5 amp lamp was used only in bottom of the line systems made by RCA and Simplex which had raw ac from a xformer powering the lamps. They built 120 cycle filters in to the amp circuits to try to take the "grunt" out of the reproduction. You can imagine what this did to the lower fundamental range.  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 11-05-2002 02:19 PM                     FWIW: The voltage is NOT that critical. Obviously you shouldn't go over the rated voltage, but you can go under with no problem. I've routinely underdriven exciters to extend lamp life, and as long as you've still got a decent amount of light it has relatively little impact on volume or frequency response.  |  IP: Logged Adam Fraser Master Film Handler Posts: 499 From: Houghton Lake, MI, USA Registered: Dec 2001 posted 11-05-2002 04:33 PM                        Thanks Jeff, that is what i was wondering. I have many power supplies around here that would work. (Quite a few electronic gadgets that have died). I will probably try to use one of the adapters that is closest to the original voltage and amperage and see how it does.  |  IP: Logged Adam Fraser Master Film Handler Posts: 499 From: Houghton Lake, MI, USA Registered: Dec 2001 posted 11-07-2002 10:40 PM                        Update: Found 2 solar cells in the attic and installed one of them. Still have to wire up the motor, add oil, and put a new switch in as the plastic on it is cracked before I see how well it runs. Here it is so far. BTW, I should have a projector head within a few weeks too. ------------------ Adam Fraser www.pinestheatre.com  |  IP: Logged Adam Fraser Master Film Handler Posts: 499 From: Houghton Lake, MI, USA Registered: Dec 2001 posted 12-29-2002 10:01 PM                        Update: I have a Simplex E-7 hopefully showing up tomorrow. Anything I should be aware of on these machines before I get up and running? I am trained on X-L's and have read the E-7 manual. Also, is there a standard length belt for 2000 foot reel arms? I have the style that uses the weights in the arm to adjust slippage, not the friction clutch. If not no big deal I can just measure when I get it together.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-30-2002 11:40 AM                     E7's with the oblique drive shaft rather than the verticle one are more prone to trouble By the way the best excitor level is 80% of its rateing as that will give the best ratio of bulb life to eveness of filament illumination  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 12-31-2002 09:03 AM                     The E7 should be little trouble. Gord mentioned the oblique shaft model, although "more troublesome" they did run quite a few shows in their time. I would hope you get a vertical shaft model though! The E7 isn't very suitable for platter operation because of the "one-shot" oiling system. You must have the oil catcher tray between the projector and soundhead... when you push the oiler all the oil delivered will make its way into the soundhead otherwise. Quite a bit will even with the tray. Check the sprockets! It may have "silent" sprockets (unlikely) or CS sprockets (likely). CS sprockets will work OK but the narrow teeth are very prone to hooking so if it has a lot of hours you may be in trouble. New sprockets will kill your budget, but you should be able to get good used or NOS CS constant speed sprockets for a song. I would recommend a VKF intermittent if you can find one for a decent price. Changing the intermittent sprocket is a nightmare on those things I think... tapered drive pin maybe?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-31-2002 09:33 AM                     The oblique shaft machine was quieter but defintely not as robust especially with large reels.The intermittent sprocket was usually taperpinned on so a v guide is needed The oneshot oiling was very reliable and really no more messy than the old oil tubes on a super or standard since they were supposed to have several drops put in each every day as well  |  IP: Logged Bob Koch Expert Film Handler Posts: 183 From: williams ca Registered: Nov 2001 posted 12-31-2002 12:31 PM                     Im a very old man and the first E7 I saw in 1938 did`nt have taper pins on the intermittent sprocket, none of them ever did.  |  IP: Logged Adam Fraser Master Film Handler Posts: 499 From: Houghton Lake, MI, USA Registered: Dec 2001 posted 12-31-2002 02:57 PM                        Well, UPS busted the shutter and shutter guards so the projector is going to their claim center so I can get my money back or they give me the money to repair it. I guess my project will have to wait a few more weeks. = UPS, it looks like they must have threw it a few times while it was being delivered as it was very, very well packed.  |  IP: Logged Sam Hunter Jedi Master Film Handler Posts: 779 From: West Monroe, LA, USA Registered: Jan 2002 posted 01-01-2003 10:46 PM                     Hey Adam, Sorry to hear about your shipping problem, I only hope you find a projector head that's complete and not butchered like mine was. Anyway I thought you might like to see my sound system and exciter power supply for my rig.  |  IP: Logged Jeff Stricker Master Film Handler Posts: 481 From: Calumet, Mi USA Registered: Nov 1999 posted 01-02-2003 06:01 AM                     Sorry to hear of your shipping problems. UPS is the worst shipping outfit in the country in my opinion. They never make good on damages - always say the packing was insufficient Sam - I like your vintage tube amp!  |  IP: Logged Adam Fraser Master Film Handler Posts: 499 From: Houghton Lake, MI, USA Registered: Dec 2001 posted 01-02-2003 10:03 AM                        Nice set-up Sam, mine will probably end up similar. But have to get this damn projector problem fixed. Too bad as this was a very good projector with nothing missing and everything moved freely. But the shutter guard was in 5 pieces and the shutter was broken into 3 pieces.  |  IP: Logged

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