8mm Forum: Specto 500 8/16 120V 300W halogen conversion

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Topic: Specto 500 8/16 120V 300W halogen conversion

James Gillespie
Junior
Posts: 16
From: Toronto, ON, Canada
Registered: Nov 2013

posted November 22, 2013 09:23 AM

I am hoping to learn from members who have experience with halogen conversion of the Specto 500 lamphouse. Would like to draw 120V power, for the QLV-1 halogen lampholder, from the availble 240V source if possible. If necessary, I am prepared to run a new 120V line to the projector specifically for the lamphouse and possibly an extra cooling fan.
Cheers, James

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Film is like rope ...
A Sailor's work is never done ...
Press on !!

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Maurice Leakey
Film God

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

posted November 22, 2013 09:59 AM

You mention you have a 240 volt source. Here is what my Specto 500 has been converted for using.
http://www.uklightbulbs.co.uk/cgi-bin/site-editor.pl/8/-ecommerce?action=item;item=A1247;eid=P405716

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Maurice

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Michael Wright
Expert Film Handler

Posts: 184
From: Chorley, Lancashire, England
Registered: Dec 2008

posted November 23, 2013 02:44 AM

Hi Maurice, would this lamp be suitable for the older Spectos that originally had a 30 volt lamp? Cheers MIKE

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Maurice Leakey
Film God

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

posted November 23, 2013 03:51 AM

No, Michael.
The 30volt lamp was 100watt, the model 500 had a 115volt 500watt lamp. Therefore, the 100watt model would have insufficient cooling.

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Maurice

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James Gillespie
Junior
Posts: 16
From: Toronto, ON, Canada
Registered: Nov 2013

posted November 27, 2013 10:36 AM

... I am midway through a conversion to 120v 300w Halogen ELH lamp!
... Cleared away old resistor/pre-heat coil from old lamphouse.
... Ran new 120v supply to projector, fuse, switch, etc.
... Today will shop for a quiet computer cooling fan to add in the lamphouse.
... Cheers, James

--------------------
Film is like rope ...
A Sailor's work is never done ...
Press on !!

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James Gillespie
Junior
Posts: 16
From: Toronto, ON, Canada
Registered: Nov 2013

posted December 06, 2013 11:57 AM

Dino had mentioned that on his Specto there was a transformer reducing the lamphouse current to 110Vac.

With my Specto the 120V 500W lamp part of the circuit was dependent on the
Resistance in the pre-heat coil, and even varied with change in motor speed.
So, cleared away the old coil and left motor circuit intact at 240V.

So I have run a separate 120V line to the projector for the halogen lamp and additional CPU cooling fans run off of a wee 12V 1Amp transformer.

I removed all obstructions and established required 'working distance' of lamp to film plane, and have amazingly brilliant light in the frame but a strange large circle of fainter light from the reflector bulb ... Will post pics later

--------------------
Film is like rope ...
A Sailor's work is never done ...
Press on !!

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