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Author Topic: Non-Standard Resistor needed Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 03-04-2003 08:18 PM                     Anyone know of a supplier for a 20W 75K enamel resistor? It's not exactly a "standard" size.  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 03-04-2003 08:39 PM                  Not sure what you mean by a "standard" size. If it's the run-of-the-mill axial-lead vitreous enamel power resistor, then it is indeed a standard resistor. Check out Ohmite for a part # B20J75K (I think). I'm sure they have a place listed where you can buy it. If that's not the type, they have many others. >>> Phil  |  IP: Logged Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 03-04-2003 08:53 PM                     I'm actually looking for a lug-type enamel power resistor, not an axial lead. Ohmite doesn't list this part number, but it should be L20J75K ( L lug 20 20-watt J75K 75K ohm ) The B20J75K is an axial lead type and would not be an exact replacement for the current unit, however, if all else fails, it could be made to work. FWIW this is to replace R18 in an Altec 1570B Jonathan  |  IP: Logged Jim Spohn Film Handler Posts: 95 From: Bakersfield, CA, USA Registered: Jan 2003 posted 03-05-2003 10:04 AM                     Contact Mouser Electronics at (800) 346-6873 or Newark Electronics at (800) 263-9275 or Digi-Key Electronics at (800)344-4539 All of those places should be able to supply what you need.....Jim  |  IP: Logged Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 03-05-2003 04:39 PM                     Already tried Mouser and Newark, just tried Digi-Key. No go. Ohmite doesn't make exactly what I need. Don't know who does. Jonathan  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 03-05-2003 04:40 PM                     Did you actually try asking them as opposed to their catalogs? --jhawk  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-05-2003 06:31 PM                     Jon, You might have to make it up out of several different values in parallel to arrive at the value you need. High value - high wattage resistirs are not very common these days. Also consider using a resistior with a variable tap. I'll check here in town for you tommrrow. A place here called Ra-Elco has a ton of high wattage resistors. That may have once been a common part bak in the days of vacuum tubes but you won't find it very common today. Jon, I just checked the Digi Key catalog and you could series three 10 watt 25K resistors for 75K @ 30 watts.... Center part of the page, 89 series, of this link. They are 1% value and not too expensive, about 7 bucks each. http://dkc3.digikey.com/PDF/T031/0723-0725.pdf Mark @ CLACO  |  IP: Logged Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 03-05-2003 07:23 PM                     Mark, Yeah, I know I can do something like that if necessary, but just for kicks it would be nice to replace it with exactly the same part (it might be a pipe dream, but I can hope). Also, there isn't a whole lot of room in there for messing around with 900+ volts and a bunch of resistors. J-Hawk, yes I did call them Jonathan  |  IP: Logged Joe Morris Film Handler Posts: 35 From: Papillion, NE, USA Registered: Jan 2003 posted 03-05-2003 11:07 PM                     can you take a picture of it so we can see it?  |  IP: Logged Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 03-05-2003 11:23 PM                     Ohmite 270 series If Ohmite made a 20watt 75k version of this it would be exactly what I need . They do have 50 and 100watt versions but those are a bit too big  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 03-05-2003 11:37 PM                    what about the one they show on the chart that says L25 25watt with 0.15-100 ohms.  |  IP: Logged Sam Hunter Jedi Master Film Handler Posts: 779 From: West Monroe, LA, USA Registered: Jan 2002 posted 03-05-2003 11:39 PM                     Jon, this may be a longshot but check with some Motorola 2way shops and see if the have any of those Bleeder/Devider resiters left over. Seems to me they used that value or close to it in there old Tube BY stations. Oh and check on the Newark Electronics website. They have almost anything you could want.  |  IP: Logged Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 03-06-2003 07:16 AM                     Thanks for all of the replies guys, Daryl, The L25 resistors of the 270 series are not available in a 75k value (click on the link above and then click on "stock part numbers and availability") Sam, Good idea, I'll try that. Newark doesn't have what I need, nor does Mouser, or Digi-Key. (see above posts) Jonathan  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-06-2003 08:41 AM                     Caddock doesmake a 75K 30 watt resistor FYI. Mark @ CLACO  |  IP: Logged Ken Layton Phenomenal Film Handler Posts: 1452 From: Olympia, Wash. USA Registered: Sep 1999 posted 03-06-2003 08:52 AM                     Dale may also make one. Also try Antique Electronics (www.tubesandmore.com) [ 03-06-2003, 03:43 PM: Message edited by: Ken Layton ]  |  IP: Logged

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