8mm Forum: Mongonery Ward duel 8

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Posted by Matthew Baetsen (Member # 1450) on January 30, 2009, 07:36 AM:

I have a duel 8 projector my question is can anyone tell me how to modify it to take modern bulbs.

Posted by Steve Klare (Member # 12) on January 30, 2009, 04:45 PM:

Hi Matthew,

The first step is to make sure you can't actually get the correct bulb. It takes a little digging sometimes. Even the hopelessly obsolete ones turn up when they close up old photo shops and warehouses.

Do you have the code for the bulb? Often it's a three letter sequence like "EFP" (for example).

Converting a projector to take a different bulb is done sometimes, but it is touchy business. The geometry of the bulb usually doesn't line up nicely with the optics of the projector. Beyond that there is the issue of the electric power available vs. what the bulb needs.

Posted by Matthew Baetsen (Member # 1450) on January 31, 2009, 12:08 PM:

i can find a bulb i just thought it would be easier to convert so that it would take a bulb i could just pick up at the store as opposed to the internet.

Posted by Steve Klare (Member # 12) on January 31, 2009, 05:11 PM:

Ah!, but you see 8mm film basically does not exist in the normal, everyday world, only on the internet. If you walk into any 4 wall camera or electronics store and ask for anything related to 8mm film, assuming you are able to find someone who has the remotest idea what you are talking about, they are almost guaranteed to say "Nobody's used that stuff for 25 years. Heave it in the trash and buy this $5,000 flat panel TV!" On the Internet, they are proven wrong every day.

If you find a bulb that is the same size, shape, voltage and wattage as the one in the projector you have a shot at it. Hopefully it will use the same electrical connector or it is easy to change over to one it does. There is a decent chance the filament won't be in the right place to get a bright picture, but you can try. These are tiny frames of film, a couple of millimeters out here or there make all the difference. I put the correct bulb in one of my machines once, but the bulb edge was resting on top of a ridge in the mounting plate instead of sitting next to it. It was maybe 2 or 3mm out of place and the picture looked really dim

The best way is to find the exact bulb.

What is the model number of your machine? Let's see if we can find the right bulb. Maybe with a little luck you can find it locally if you know what you are asking for.

Posted by Paul Adsett (Member # 25) on February 01, 2009, 09:57 AM:

Mathew, I would follow Steve's advice. The probability that you can get the exact replacement bulb is very high. Look all over the machine - is there a sticker inside the machine that states something like "12v 100 watt lamp max' ?. If you can determine the voltage and wattage of the old bulb, then a replacement can almost certainly be identified. Why not post a picture of the machine here, as well as a picture of the interior where the lamp goes. That may be enough for us to identify the lamp type.
Places like TOP BULB here in the USA carry hundreds of 8mm projector lamp bulbs.

Posted by Matthew Baetsen (Member # 1450) on February 02, 2009, 11:21 PM:

yes it is an 80w 30v dgb bulb, thank you for the advice. i just thought there would be an everyday bulb for a similar purpose out there but thank you very much.

Posted by Brad Miller (Member # 2) on February 03, 2009, 02:32 AM:

Is that the Montgomery Ward sprocketless drive projector that ONLY uses the claw to advance the film?

If so my parents had one of those and it thoroughly scratched everything that went through it. Take a close look at the film path before you run anything you care about on it.

It was for all practical purposes this evil model.

Posted by Steve Klare (Member # 12) on February 03, 2009, 06:07 AM:

That evil projector looks to be a re-badged GAF. My neighbor ran miles of film through hers and never cleaned it: makes me cringe!. If I could find it today it probably weighs more in crud than machine!

Matt, so you're looking for this?

http://www.replacementlightbulbs.com/lampdgbdmd.html

I think an exact replacement is the only thing that's going to do the job here.

Posted by Matthew Baetsen (Member # 1450) on February 07, 2009, 05:40 PM:

yes that is what i am looking for thanks guys and i only use that projector long enough to get all my child home videos onto my digital camcorder unless someone knows a better way to do this.

Posted by Steve Klare (Member # 12) on February 07, 2009, 07:21 PM:

The problem you will run into is unless you can operate the projector at the correct frames per second (about 20) you will get a really annoying flicker in the final video transfer. It's a pretty exact fine-tune once you are all set up for the transfer because if you are just close, the flicker will just be slow and not actually go away.

This machine may be variable FPS, but it probably isn't. You should figure this out before you invest in that new bulb.

PS: We call 'em "movies" until they are actually on video! [Wink]

Posted by Matthew Baetsen (Member # 1450) on February 08, 2009, 10:45 AM:

would you know how to ajust the fps? i have been like you said able to reduse the flicker by getting close but a big problem i have been running into i focus my camera does not focus fast enough from dark sections to light sections. The projector has a slow and still that i can move a frame at a time. the slow only movies at 6 frames per sec.

Posted by Steve Klare (Member # 12) on February 08, 2009, 04:23 PM:

If you're lucky rhere's a knob on the control panel you can tune up and down until the flickering stops, if you aren't quite as lucky there's a speed control potentiometer somewhere inside the machine. If you are out of luck the designers decided fixed values were close enough and let it go at that.

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