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Author Topic: Rectifier information needed Bill Mantz Film Handler Posts: 91 From: Plano, TX Registered: Feb 2001 posted 08-25-2003 03:50 AM                     I have a Christie K20 lamphouse and will be using 1K bulb. I have a Kneisley Kni-Tron rectifier Model R-2180-4 input is a single phase 115 volts output 18 volts DC at 30 amps. Dose any one have a manual or any other information on this rectifier. I also have a LP Associates 8501 rectifier which rectifier would be the best one two use. Thanks [ 08-25-2003, 06:17 AM: Message edited by: Bill Mantz ]  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 08-25-2003 05:02 AM                        Bill, I don't know the supply, but I'm going to take a wild stab at this & say that I don't think it will work for you. That looks suspiciously like a carbon arc supply. If so, it won't provide the no-load voltage you'll need to ignite a xenon lamp. Then there's the face plate info you posted. 18 volts at 30 amps rates the supply at 540 watts, full out. Even if it has the filtering required for a xenon lamp, and if you can get the no-load volts out of it (which I doubt), it won't give you enough amperage to handle your 1kW bulb. That old asbestos covered wire is just about a dead giveaway, too, since that stuff was so popular during the arc days. Hope I don't wind up with egg on da face, but I think you'll be looking for another supply for this application.  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 08-25-2003 05:19 AM                        Yup, it's a carbon arc rectifier. You could use it in conjunction with a Kniesly Konversion to operate a small xenon lamp, but you wouldn't have enough current to run your 1kw lamp.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 08-25-2003 06:37 AM                     The Kneisley is a 500 watt xenon model for a lamphouse that they made for small screening rooms and for 16/35mm projectors.When they first made the product 30 years ago asbestos cable was still an option. 18 volt / 30 amp is for xenon, carbon arc runs at a higher voltage. The Kneisley is also very ( old design ) inefficient requiring a bit of A.C. power to give you the 500 watts. The LP 8501 is the best match.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 08-25-2003 07:37 AM                       FWIW, most older Kneisleys look like carbon arc supplies.  |  IP: Logged Adam Fraser Master Film Handler Posts: 499 From: Houghton Lake, MI, USA Registered: Dec 2001 posted 08-25-2003 10:01 AM                        Bill, I believe we have the exact same rectifier for our 500w spotlight that we bought from kniesley. I may be able to copy some pages if I can find the manual. But sure looks exactly like our spotlight supply.  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 08-25-2003 11:14 AM                        OK... I'll take Half an egg... ...it LOOKS like a carbon arc supply!  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 08-25-2003 01:52 PM                        Ditto! It looks like a carbon arc supply. I guess never having run carbons on such a 'small' power supply I would have clued in. Who whoulda thunk!  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 08-25-2003 05:08 PM                        Question: I notice it says Toledo, Ohio on the plaquette. That is where Strong was located before moving to Nebraska. Is there a connection between Strong and Kneisley?  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 08-25-2003 05:36 PM                       Not to my knowledge. Strong just happened to be in Toledo before Ballantyne bought them.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 08-25-2003 05:46 PM                     Dick Kneisley worked for Strong in the 1930's and later started his company making high intensity carbon arc kits to replace low intensity units. He lived to see his 90's. Dick retired to Florida. Kneisley also makes equipment for the graphics art industry.  |  IP: Logged Bill Mantz Film Handler Posts: 91 From: Plano, TX Registered: Feb 2001 posted 08-25-2003 11:47 PM                     Thank for the information. Now a new question who makes small 500 Watt lamphouses that I could retrofit a 16mm or a 8mm projector to get more light on the screen.  |  IP: Logged William H. Ward Film Handler Posts: 27 From: SAn Antonio, Texas Registered: Jul 2003 posted 08-26-2003 08:43 AM                     Hi... Let me add this.... I remember a 30 amp 28vdc rectifier made for carbon-arcs for the Strong Jr. Hi lamps for 16mm use. It kinda looked like the one in the photo. The lamp burned the Pearlex trim (6mm pos x 5.5mm neg) at 30 amps. I also knew Kniesly built a rectifier for a 500w xenon and looked similar, but it had no asbestos leads. Its open circuit voltage was 70vdc and load was 16-21 volts at 28-30 amps. Its output was filtered by a set of capacitors and 2 chokes. Extensive filtering of dc for xenon bulbs is a has to be. Carbon-arc supplies do not have a requirement for as much smoothing. Check ou your unit to see if it has the extensive filtering.  |  IP: Logged

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