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Electro Controls Fresnel

Discussion in 'Lighting and Electrics' started by cw4u, May 7, 2009.

  1. cw4u

    cw4u Member

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    I know this might be a stupid question, but how do I get the lamp out of this thing? I've got about 24 that are laying on stage because they haven't had a lamp for 4 years.

    If somebody could help me out, I'd appreciate it.
     
  2. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    Not a stupid question. I'm guessing it's the medium prefocus socket that is causing the issues.
    [​IMG]
    Medium Prefocus Lamp Socket

    Two important points:
    1. The "Button" in the bottom center of the socket is spring-loaded, and
    2. The two "fins" on the lamp base are two different sizes.

    [Edit: With the unit unplugged...] To remove a lamp, push straight down toward the socket while simultaneously turning the lamp 90° counter-clockwise until the fins clear the slots, then lift straight up. Much easier said than done, in the confines of a 6" Fresnel. It's slightly easier if you move the socket/reflector sled toward the lens (full flood focus) first.

    See also this thread if your sockets need replacing: http://www.controlbooth.com/forums/lighting/11026-altman-6-fresnel-lamp-base-problems.html.
     
    Last edited: May 8, 2009
  3. dramatech

    dramatech Well-Known Member

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    Sometimes even when the fins of the lamp line up with the holes they go into and come out of, they will be bent and seem impossible to remove. Using a small jewelers screwdriver, push the socket edges down a bit so that the lamp can make it's way out. Even at that, it is a royal pain in the XXX. Once you have the lamp out you might want to look and reshaping the edges of the socket (power OFF PLEASE).
    If you replace the socket, be aware that the shiny porcelin sockets have a different mounting hole configuration than the dull or matted finish sockets. The Electro Contols require the matted finish while the Altmans use the shiny ones. You can always redrill holes to make a socket, not meant for the instrument, fit. It all has to do with the alignment of the filament in the lamp. Check that position, before installing a new socket to make sure that the new socket will align the filament correctly. The EC Fresnels are old, but if properly maintained are one of the most serviceable Fresnels in the theatre.
     
  4. cw4u

    cw4u Member

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    Thanks so much.

    What type of bulb should I order for these lights? I saw on a site that they have different lamps for different lengths. How do I determine which length I need (3", 6", or 8"??)
     
  5. Footer

    Footer Senior Team Senior Team Premium Member

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    Measure the lens of the fixture. If you have a 6" fresnel, It is recommended (from here at least) to go with a BTH lamp.
     
  6. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    (We call them lamps, not bulbs;), see also http://www.controlbooth.com/forums/glossary/10203-bulb.html.) It's not length--Fresnels are categorized by their lens diameter (and to a lesser extent, socket-type). If your fixture is indeed an Electro Controls #3466:
    [​IMG]

    You have the following choices:
    Note that the 1000W-BTR is not an option for you, as this particular fixture was never listed for any wattage greater than 750W.
     
    Last edited: May 8, 2009
  7. cw4u

    cw4u Member

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    Thanks for the bulb/lamp thing. I know they're called lamps, I just interchange the word to frequently.

    I'll get the 500w lamps to put in them. That's what they originally had in them, so I'll just use that.
     
  8. IEGPR

    IEGPR Member

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    We use the 500 watt BTL in our fixtures
     
  9. misterm

    misterm Active Member

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    We have an entire Electro Controls set-up in our auditorium. Unfortunately. You can look in any theatrical supply catalogue (I prefer BMI) and check find the right lamp. I found them easily and replaced them not so easily. They are an absolute pain.
    Now if only we could get that stupid board and dimmers to work...
     
  10. midgetgreen11

    midgetgreen11 Active Member

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    Sorry to hijack here---- I just worked in a high school with Electro Controls dimmers---- during our Saturday night performance the Demux convertor died. Not fun to work around. Let's just say we ran the show off dimmer breakers.
     
  11. misterm

    misterm Active Member

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    our board doesnt work at all. or there's something wrong in the wiring, which we can't get to. either way, the whole system is worthless and needs to be replaced, but in a school system that's laying off teachers, i'm thankful for a job!
     
    Last edited: May 12, 2009
  12. Kelite

    Kelite Apollo Staff Premium Member

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    Uh, you mean laying off?


    :confused:
     
  13. misterm

    misterm Active Member

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    yes! thanks for catching that! although there are a few who need to get laid....:twisted:
     
  14. Kelite

    Kelite Apollo Staff Premium Member

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    I'm sorry Mister M, I just couldn't pass up a slow, low one over the plate....



    Thanks for your humorous side!


    :)
     

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