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Author Topic: Tungar tubes Jim Spohn Film Handler Posts: 95 From: Bakersfield, CA, USA Registered: Jan 2003 posted 03-25-2004 02:41 PM                     Can anyone tell me how to substitute diodes for tungar tubes? They are used as a pair in my 16mm projector rectifier. These tubes have three connections. One on the base tip --one on the screw base shell and then the plate connection on top. Thanks for any help....Jim  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 03-25-2004 02:46 PM                     check out www.widescreenmuseum.com/sound/rca05-06.htm. It has a simple layout for a tungar rectifier you should be able to adapt from.  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 03-25-2004 02:48 PM                        Are tungar tubes the same thing as sil-tubes? The ones I'm familiar with look like metal soup cans with mogul or Edison lightbulb bases. I've also seen "rectifier tubes" which look like giant lightbulbs. I assume that these are something different entirely?  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 03-25-2004 02:51 PM                     The tungars are the ones that look like giant light bulbs, Scott.  |  IP: Logged Jim Spohn Film Handler Posts: 95 From: Bakersfield, CA, USA Registered: Jan 2003 posted 03-25-2004 03:05 PM                     Thanks, Jeff thats just what I was looking for. Scott, your right on the money, they have mogul base sockets and a connection on the top for the plate. Thanks again...Jim  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 03-25-2004 03:10 PM                     appropos of nothing, but when I was in Jr. High in the late '50's we had a carbon follow spot that had a tungar rectifier. Damn thing looked like someting out of a Flash Gordon set.  |  IP: Logged Jon Miller Jedi Master Film Handler Posts: 973 From: San Diego, CA, USA Registered: Sep 1999 posted 03-25-2004 08:38 PM                     Here's one of a quartet of solid-state Tungar bulb replacements I made about a decade ago for a Strong-built National Theatre Supply "intermediate four-tube" carbon arc rectifier... I used DSI75-12B diodes, rated at 110A at 1200V (seriously overrated, yes, but very able to handle the current surge of striking an arc). The diode and heatsink are mounted to a pair of brass L-brackets, which I attached to a five-inch length of 1-1/2" diameter type "L" copper pipe using brass screws. The mogul screw bases came from burned-out sodium-vapor street-light bulbs. I soldered a pigtail to the diode's tip for something to attach the large Fahnestock clips to and to keep the clips spaced safely away from the heatsinks. The electrical connection at the screw base is through the shell only; since there is no need to heat a filament, the tip connection is moot. What can I say? They're ugly, but they work. I gained about five extra amperes of available current from the rectifier in switching from Tungars to these contraptions.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 03-25-2004 08:46 PM                    That's a great idea. Here is a 2-tube Tungar rectifier I have for a baby arc lamp: http://steve.filmteknik.com/tungar.html  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 03-25-2004 09:22 PM                       Don't forget to lower the input power to the unit(s) as you will gain the voltage drop that was formerly across the filaments of the Tungar bulbs.  |  IP: Logged Jim Spohn Film Handler Posts: 95 From: Bakersfield, CA, USA Registered: Jan 2003 posted 03-26-2004 09:50 AM                     Thanks Jon, what a nice replacement unit you built. I'm going to fashion my units very much like yours thanks to your inspiration. Steve...I have two rectifiers just like yours. The lamps were built by Strong. They look just like a magna-arc except they are 17" long and 10" in diameter, they're ultra cute. The lamp may be seen in the Film-tech manuals under Strong Low Intensity lamp. By changing the the shunt for the motor, you can burn 7mm and 8mm copper jacket carbons and get a heck of a bright light for 16 or 35mm projectors. Thanks Guys for all your help.....Jim  |  IP: Logged Ken Layton Phenomenal Film Handler Posts: 1452 From: Olympia, Wash. USA Registered: Sep 1999 posted 03-26-2004 10:10 AM                     A sil tube is the solid state replacement for a tungar tube.  |  IP: Logged Rick Long Jedi Master Film Handler Posts: 759 From: Toronto, Ontario, Canada Registered: Nov 1999 posted 03-26-2004 11:07 PM                     Kneisley R-1160 as I recall.  |  IP: Logged

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