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gulfman
Joined: 04 Apr 2012 Posts: 3 Location: norfolk england
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Posted: Thu Apr 05, 2012 9:35 pm Post subject: lamp type |
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hi can anybody help i have bought a , graflex 16mm projector model 821 the lamp is missing i need lamp type volts & any info on this projector. thanks john. _________________ i like to get old projectors up and running |
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Henry
Joined: 09 May 2001 Posts: 1643 Location: Allentown, Pennsylvania
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45PSS
Joined: 28 Sep 2001 Posts: 4081 Location: Mid Peninsula, Ca.
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Posted: Fri Apr 06, 2012 7:03 am Post subject: |
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Another potential source
http://www.donsbulbs.com/
Any chance/hint the 821 is a rebadged make/model by another manufacture? _________________ The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU. |
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gulfman
Joined: 04 Apr 2012 Posts: 3 Location: norfolk england
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Posted: Fri Apr 06, 2012 12:45 pm Post subject: lamps |
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thanks to all info sent,i think my model is madw by graflex i have a 4pin lamp 21-5v 150w. dont like to fit it till i can make sure its the right volts. the ser No of the projector is 372706.if that helps.john. _________________ i like to get old projectors up and running |
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45PSS
Joined: 28 Sep 2001 Posts: 4081 Location: Mid Peninsula, Ca.
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Posted: Wed Apr 18, 2012 2:16 am Post subject: |
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If no one responds with a bulb number then:
1. look at the socket for the bulb. it will have either an index slot in the center of the socket or different sizes for at least 1 of the 4 pins. The bulb should align so that the projected light faces the lens.
2. 21.5V - 150W, marked values.
Power=E (volts) * I (current).
I=P/E
I=150/21.5
I=6.9767 amps.
A lower voltage bulb that is the same wattage will burn out quicker than the standard bulb.
A higher voltage bulb that is the same wattage will last longer but be dimmer, lower light level output.
A higher wattage bulb at any voltage will draw more current burning the wiring or any transformer in the lamp electrical system. DO NOT use a higher wattage bulb.
A lower wattage bulb will burn brighter and possibly damage film and will burn out quickly. _________________ The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU. |
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gulfman
Joined: 04 Apr 2012 Posts: 3 Location: norfolk england
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Posted: Wed Apr 18, 2012 9:04 pm Post subject: lamp type |
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45PSS wrote: | If no one responds with a bulb number then:
1. look at the socket for the bulb. it will have either an index slot in the center of the socket or different sizes for at least 1 of the 4 pins. The bulb should align so that the projected light faces the lens.
2. 21.5V - 150W, marked values.
Power=E (volts) * I (current).
I=P/E
I=150/21.5
I=6.9767 amps.
A lower voltage bulb that is the same wattage will burn out quicker than the standard bulb.
A higher voltage bulb that is the same wattage will last longer but be dimmer, lower light level output.
A higher wattage bulb at any voltage will draw more current burning the wiring or any transformer in the lamp electrical system. DO NOT use a higher wattage bulb.
A lower wattage bulb will burn brighter and possibly damage film and will burn out quickly. |
Quote: | | thanks i will fit lamp and hope for the best. _________________ i like to get old projectors up and running |
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