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Author Topic: Rectifier buzzing Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 05-08-2006 09:19 PM                     quote: John Pytlak Putting real "tar" or asphalt on the windings of a transformer would create a fire hazard. Some can run quite hot. You're right! Insulating varnish is a special sort of thing that is also flame resistant at least to some degree. Mark  |  IP: Logged Thomas King Expert Film Handler Posts: 119 From: Sheffield, Yorkshire, England Registered: Oct 2004 posted 05-09-2006 05:17 AM                        We've got a big T&R rectifier from circa 1950. It buzzes like a madman, but I can't get into it to tighten its mountings because genius! we have a false floor in the booth which the unit goes through, meaning I can't get the side panels off because there are screws under the floor level.  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 05-09-2006 05:43 AM                     Thomas, your T&R is not that old! (Assuming it's the 123/B? model) Good rectifiers those, will last forever as long as the cooling fan is OK.  |  IP: Logged Thomas King Expert Film Handler Posts: 119 From: Sheffield, Yorkshire, England Registered: Oct 2004 posted 05-09-2006 06:21 AM                        Pete; you've made me doubt myself now. I'll check the manufacture date on it when I get a chance and get back to you! I'm not sure how it's doing in terms of voltage stability; we've got an engineer coming up this summer so I'll get him to check it then.  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 05-09-2006 07:00 AM                     T&R made really 3 models, there's the 100A version which is about 18" all round, there's the 123/B series which are good for about 75A, those are the most common, about 18" square, and a couple of feet tall. Then there's the compacts, which are maybe a foot square, and a couple of feet tall, but won't push as much current as the others. Post a photo, I'll ID the beast for you.  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 05-10-2006 12:39 AM                        Matthew, is this the baby kniesly "kni-tron supply and lamphouse that both look very similar? I think the model is l-100-3 for the lamphouse. I've got one too and mine has always buzzed, just let it warm up for about 10 minutes and it purrs like a kitten, well, nearly so Pics of the setup are in the warehouse. JJ  |  IP: Logged

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