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This topic comprises 2 pages: 1 2
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Author
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Topic: Converting Marc 300 projectors.
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Ken Layton
Phenomenal Film Handler
Posts: 1452
From: Olympia, Wash. USA
Registered: Sep 1999
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posted 02-20-2003 05:20 PM
There is some confusion to clear up. The Marc-300/16 is a different bulb than the Marc-300/16A. The 16A has a 2-1/4" reflector and was replaced in the early 1980's by the Gemini 300. The Gemini 300 was merely an improved (longer life) version of the 16A. A Marc 300 power suplly will operate the Gemini 300, Marc-300/16A, and Marc-300/16. The Marc-350 bulb can only operate with power supplies that specifically state that it will. General Electric and later it's successor North American Power Supplies (N.A.P.S.) built a switching regulator power supply with current sensing built in that would adjust itself to ANY version of the Marc lamps (including Marc-350). This is the power supply that Brad mentioned that also has dimming (standby) feature.
Bell & Howell had these models that used the Marc lamps:
560A Manual threading, tube amplifier (Marc-300/16 lamp)
566A Automatic threading, tube amplifier (Marc-300/16 lamp)
566T Automatic Threading, transistor amplifier (Marc-300/16 lamp)
566EX export version of 566A
566EXT export version of 566T
567 Automatic threading, transistor amp (Marc-350/16T)
1568A Automatic threading, electronic pushbutton control (Gemini-300 lamp)
1568-B Automatic Threading, electronic pushbutton controls, multi-media computer connector, shaft encoder (Gemini-300 lamp)
All above model included "Changeover" for dual machine setups.
There are some versions of the Marc power supply designed to operate on 400 hz power used on airplanes.
[ 02-21-2003, 08:25 AM: Message edited by: Ken Layton ]
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Stephen Furley
Film God
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 02-20-2003 06:30 PM
Scott wrote:
quote:
The B&H 566 projectors use the regular MARC 300 and the Kodak Pageants (at least the one that I've worked with) use the Gemini. Not sure about the B&H 666 (with a model number like that, it must be an auto-shredder!).
Did B&H ever make a manual-thread or slotload MARC-300 model? I wouldn't mind having a pair of MARC-300 projectors, but I cannot stand their autoload machines and I won't let my prints anywhere near them.
Most british Bell and Howell 16mm machines had model numbers starting with '6'
I can't remember any of the silent ones, but the earlyest sound one I have used was the 601, this was built into a blimp case, with the small drop down door in front of the lens, and the spool arms, which were stored inside, fitted onto the case, where they were held in place by knurled head screws. The 621 was similar, but the arms just slotted into sockets in the case. These machines ran on 110V, via an external transformer. There was a lightweight version, the 626, which had a smaller loudspeaker, still in a separate case, and ran on 240V, eliminating the transformer. At least some of these machines could be fitted with plug in magnetic heads, for full or quarter width stripe. These heads were above the drum, but by making an oversize bottom loop it is just possible to thread a standard 28 frame advance magnetic print in sync. The 609 was the floor standing carbon arc version, the successor to the pre-war Filmoarc. I have a pair of these, one not quite complete, but I think I know where I can get the missing parts.
The 621 and 626 were replaced by the 631/636, which were similar, but were optical only, I think the amplifiers were also slightly different. The 631 is one of my favourites, it was introduced in the year I was born, and must have looked very modern then.
The 640 was the Mag record version, I also have one of these. These models all had the exciter lamp fed with high frequency a.c., from an oscillator.
The last of these old-type machines had a four-digit model number, it took a 240V lamp, had a partly transistorised amp, small speaker stored inside the case, and sideways opening door in front of the lens. All of these machines took the 750W A1/59 lamp as standard, but could also take the 1000W A1/91, but this was not recommended when running silent or black and white film.
Around the early '60s these machines were replaced by the totally different 'new' machines, as I still think of them, with the large lens barrel. there were many different models, the 642, or was it 641, was optical only, with simple volume and tone controls, the next model up had separate mic and film volume, and treble and bass controls; four knobs, rather than two. Then there were mag playback only and mag record/playback models. Some of these also came in autothread versions. These machines had valved (tube) amps, and took four pin valve base lamps, the A1/206 for 750W, and A1/207 for 1000W. These machines had mains voltage (240V) motors and amps, and normally took 240 V lamps, but it was possible to buy a large external transformer, similar to that supplied with the 631 etc., supply 110V to the lamp, and 240V to everything else, via separate pins on the four-pin Jones plug. There was also a smaller step-up transformer to supply 240V to the motor and amp from a 110V supply, while a 110V lamp was fed directly. This gets complicated, doesn't it?
The next models were the very similar TQ1 range, with transistorised amps, and 24V 250W halogen lamps, which were again a Bell and Howell special, and are now difficult to obtain, but it is possible to buy a conversion kit, not made by B+H, to replace the lamp and separate dichloric reflector with the standard ELC lamp. The 666A to give it its correct number was basically a Marc version of a manual threading, optical and mag playback TQ1, but I think the amplifier is more powerful.
The TQ2 and TQ3 machines were smaller and squarer, but I don't know the model numbers of any of these.
Did bell and Howell ever make a xenon machine, I've never seen one?
I have never seen an auto thread Marc machine.
At the last count, I think I had about twenty 16mm machines, six 8mm, two 9.5mm, one of which also takes 16mm, and two 35mm, different machines, not a pair. I live as a lodger in a small room, so I can't keep any of this stuff at home, it is all stored in various places, or loaned out to people.
It's half past midnight, I went to a late show at the cinema this evening, and haven't been in long, I think it's time I went to bed.
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