8mm Forum: Lamp for Specto

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Topic: Lamp for Specto

Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted October 25, 2013 12:42 PM

Can anyone help with my search for a 50v 250W lamp for a Specto? Or is there an easy way to reduce the voltage to 24v or 12v to enable conversion to a modern halogen lamp.

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Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted October 26, 2013 04:47 PM

You may try there : http://www.super-8mm-9-5mm-16-et-35.fr/lampes

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Dominique

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted October 27, 2013 02:24 PM

Thanks Dominique - Anything is worth a try. But I think I might be forced down the route of converting it to a modern lamp.

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Richard C Patchett
Master Film Handler

Posts: 424
From: Flint Mi 48506
Registered: Dec 2007

posted October 30, 2013 11:19 AM

Greetings
Is there any letters on it?
May have 1 of them
If not a picture would be nice
Please see my web site under lamps
RC

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RC’s Classic Collection
16 mm Parts & Service
Elmo, Eiki, Bell & Howell +
http://www.rcsclassic16mm.com/

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted December 16, 2013 11:44 AM

Richard
Yes sorry I should have stated that it is an A/15 50v 250w

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted December 18, 2013 05:05 AM

Terry
It seems that the A1/15 lamp is quite a rarity. I see that Grahame Newnham has them on his website as WANTED.

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Maurice

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Paul Mason
Jedi Master Film Handler

Posts: 540
From: Aldershot, Hampshire, UK
Registered: Nov 2013

posted December 18, 2013 10:42 AM

Try the Camera Centre, Hailsham. Assuming the A1/5 advertised is the same.
Projector lamps

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Paul.

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted December 18, 2013 12:50 PM

Paul
Yes that's the one but did you see the price- £37!!! and there is no guarantee that it wouldn't blow the first time you switched it on. Far better I think that I convert it to a lamp that is more readily avaiable.

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Paul Mason
Jedi Master Film Handler

Posts: 540
From: Aldershot, Hampshire, UK
Registered: Nov 2013

posted December 19, 2013 03:03 AM

Terry, I agree £37 is too much. It would be cheaper to find another working Specto Educational! I suggest you fit a 24V 150W slide projector lamp and holder, replacing the mains to 50V transformer in the base. I don't know what voltage the motor needs, hopefully 220-240V.

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Paul.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted December 19, 2013 10:20 AM

If you can get a 24 volt transformer to fit in the base, you could use the A1/223 EHJ lamp, it's 24 volt 250 watt. Very cheap. Maplin have it at £3.99, code GT86.

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Maurice

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Paul Mason
Jedi Master Film Handler

Posts: 540
From: Aldershot, Hampshire, UK
Registered: Nov 2013

posted December 19, 2013 11:09 AM

It's got a big base but the 250W lamp needs a 24volt 10.4amp transformer, the 150W lamp a 6.25amp version.

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Paul.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted December 20, 2013 02:48 AM

It's a question of phraseology.
What I should have said above was that if a 24 volt transformer will fit in the base you could use the 250 watt lamp.

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Maurice

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted December 20, 2013 08:21 AM

Thanks for all the suggestions folks, it gives me food for thought. From memory the motor is 240v. Am I right?
What about a 12v transformer and a 12v 100w lamp. Would that not be bright enough? I'm just thinking that a 12v transformer would be smaller and maybe easier to get hold of. Over to you experts.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted December 20, 2013 09:54 AM

Why not consider using the A1/248, which is 240 volt, 150 watts. You will need a new lamp holder, but there would be no need to replace the transformer. And, they're quite cheap
http://www.ebay.co.uk/itm/GE-A1-248-Specialist-Halogen-Lamp-240V-150W-Capsule-G6-35-Theatre-Club-Projector-/141145194496?_trksid=p2054897.l4276

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Maurice

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted December 21, 2013 01:40 AM

Thanks Maurice
That sounds a good option and definitely worth a go.

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Paul Mason
Jedi Master Film Handler

Posts: 540
From: Aldershot, Hampshire, UK
Registered: Nov 2013

posted December 24, 2013 03:24 AM

Terry, There is one other option. Replace the A1/15 50V 250W lamp with the A1/5 115V 250W lamp with the same base. This lamp is slightly easier to find and means you can keep the original lamp holder. It's less bright than a modern halogen low voltage type and you will need a 240/115V transformer. This only needs to provide 2.2 amps so should be small.

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Paul.

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted December 26, 2013 04:01 PM

Paul
Thanks for the suggestion but I have now removed the 50v transformer and the same lamp fitting is now connected to the 240v mains supply, so that I can fit 240v lamps of which I have a few, ranging from 250w to 500w. Because the projector is now 240v even a 500w lamp will only draw 2amps so I am hoping this will solve my problem as 240v lamps are more readily available and somewhat cheaper and I have a few in stock. The only problem I see now is that I will have to be careful not to run film too slow, or use still frame, to prevent frame burn while using a more powerful lamp.

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Paul Mason
Jedi Master Film Handler

Posts: 540
From: Aldershot, Hampshire, UK
Registered: Nov 2013

posted January 13, 2014 04:33 AM

Dear All, My Specto Educational projector 50V 250W lamp developed a smoky blister and to replace it I was faced with same problem as Terry. My solution was to remove the transformer in the base and fit a 240V 300W lamp. With the necessary rewiring this worked but I found that the light output is very uneven so I don't recommend using a 240V lamp as the optics don't work properly with the larger lamp filament area. I suggest that with projectors designed for low voltage lamps don't use a lamp rated over 110-115V. I'm going to try either a 110V 250W or a 50V 250W lamp before resorting to a modern low voltage halogen lamp with the need for an expensive transformer.

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Paul.

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted January 13, 2014 12:02 PM

Paul
I did have a small problem with uneven brightness, but don't forget you have two adjustment screws on the outer casing for just that problem. One for adjusting the lamp forward or back and the other for side to side. It worked for me. The only difference in the lamps were the larger filaments so should not present a problem that cannot be resolved with the aid of the adjusting screws.

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Paul Mason
Jedi Master Film Handler

Posts: 540
From: Aldershot, Hampshire, UK
Registered: Nov 2013

posted January 28, 2014 11:06 AM

Terry, I have tried adjusting the lamp mount screws as you suggested but I am still not satisfied with the result. Perhaps it's just my projector. I am going to try a 100W 12V A1/215 lamp with a transformer from a scrap Eumig P8.

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Paul.

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Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006

posted February 22, 2014 01:48 PM

Terry I’m expecting one of the traders at my film fair on 19th April to bring a good number of Specto spares, lamps etc so I’m sure you will find this a help.

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted February 27, 2014 07:40 AM

Lee
Thanks for that suggestion. Where is the fair located?

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted February 28, 2014 03:17 AM

Terry
It's a 577 mile round trip for you to BB5 0DE.

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Maurice

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted March 01, 2014 12:41 PM

Maurice
Thanks. I would sooner cover myself in jam and sit in a wasps nest rather than make that sort of trip.

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