De vere Lamp Help Please

Discussion in 'Enlarging' started by lifethrualens, Jan 10, 2009.

  1. lifethrualens

    lifethrualens Member

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    hi im new on here

    i have just got a dever 504 and not long after setup the bulb went (it was used), so i replaced it, and after 3 days its gone again, this time it has shattered on the neck where you plug it in, is it just a bad bulb, or do i have a problem

    thanks all

    lee
     
  2. BarryWilkinson

    BarryWilkinson Subscriber

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    My guess is, either the ceramic bulb holder is badly corroded, or your power supply voltage is over 24VDC. If you have a voltmeter measure the volts across the illuminated bulb. Be careful they get very hot.

    ps Welcome to apug Lee.
     
  3. lifethrualens

    lifethrualens Member

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    is there a convertor or something i can buy to control the voltage or do i need a new power supply, thats if it is the voltage of course
     
  4. BarryWilkinson

    BarryWilkinson Subscriber

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    If the voltage is wrong, you will have to get someone to repair/adjust the power supply. I assume its a single lamp head? If so it should provide 24VDC at 250W. Check the ceramic lamp holder first as this is quite a common problem. I don't know where you are but De vere parts come up on the auction site occasionally.
     
  5. snallan

    snallan Member

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    Hi Lee, welcome to APUG.

    Which head do you have on the 504. And, as you are talking about a convertor, do you have the transtab for your enlarger (large black cube, 2 switches on the front). I take it the head uses 24V/250W ELC type lamps, if so I would recommend getting the GEC manufactured lamps, I have tried a number of other manufactured lamps and had poor results with all of them (though never a lamp shattering!), but excellent results with the GEC ones.
     
  6. Martin Aislabie

    Martin Aislabie Subscriber

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    Lee, you might just have had a bad bulb

    They don't normally go down there - its usually the filament goes with a pop - just like a conventional bulb

    I realise these things are not cheap but put another one in and give it a go - being careful not to wrist or strain the bulb body

    As usual with Halogen bulbs – don’t touch the glass with you skin – the acid in sweat weakens the glass. A paper tissue will suffice.

    Martin